For the original poster, I would ask what exactly are you trying to get out of the front standard movements? Just perspective control? Scheimpflug correction? If it's just for perspective control, I agree that a perspective control lens is a great option. I have used PC lenses for interiors for a long time, currently use a 17mm TS from Canon on a 5DS and it does just fine for that stuff. Id question the between the lens adapter because it would probably really impact ability to reach infinity focus - I haven't seen much fotodiox stuff that is well thought out optically
Back movements are useful too if you are creating stitched "Hero" images - mostly in studio although it could be done in scenic photography - not nearly as useful for people photography or generally anything where the subject has motion. I use a Sinar P2 - with a bit of careful eBay shopping you can find them for a few hundred bucks on eBay anymore. Back in the film days I could NEVER afford a P2, and made do with the worlds most horrible Calumet model 1 (the one with no back movement and the front standard that would fall if you looked at it crosswise - I apologize to whoever has that P.O.S. now, but it was that way when I bought it...). The micrometer drives for all movements on the back make a P or an X rear standard the cats pajamas for stitching...I also have a Sinar "C" with a "F" front standard, "X" rear standard that is j portable enough for landscape photography. I have worked out mating it to either a Leaf Credo back (Could take any M mount Phase One, too, but I own a Credo 80) or a Canon body (Using a 5DS) .
I agree with wiltw that it is very workable to mate a full frame DSLR. With careful use of the back rise/fall and shift, you can stitch about 12 frames together, and with a 5DS - that is a 500 Megapixel image - about 28.5' x 25' image if printed at 100% resolution. I first tried the stitching adapter that fits in a graflok back that you can buy on Amazon. It's a piece of junk, your expensive DSLR is just dangling off the back retained by graflok sliders-barely as it is poorly machined - a great way to risk an expensive repair bill. I sent that back and left a bad review. The way to go is a board like the one wiltw built. I've also seen a kit with a special bag bellows that has a Canon lens spline on one end and a doohickey to attach the camera body directly to the rear standard. That is an interesting idea, but I question whether you could get precision without the real standard frame attached. I bought an adapter from a German company called "just together". This is a well thought out piece - it is the minimum possible thiokness to clear the body (12mm) which is important.
There are a couple of challenges and a couple advantages to using a DSLR. The challenge is mainly that the body itself is 57mm deep, and the adapter takes up another 12mm of distance from rear element of the lens to the sensor. This means that the shortest lens that is practical is a 120mm if you want to use any movements at all. A 90mm is the shortest that I can get to work at all. The other is something that you can bark your shins on when stitching: the lens flange on the body will easily vignette a portion of the image. The advantages are that live view actually works, which is awesome. I just use the focal plane shutter in the body and don't bother with the shutter on the lens other than to set the aperture. Flash sync, if needed, is then on the body and you are limited in shutter speeds available for sync.
I generally tether using Capture One in studio, which is why the laptop is on the accessory tray of my stand
A medium format back sidesteps the body depth and vignette issue as the sensor plane is pretty much right where the film plane would be if using a film holder. Phase One did make an adapter that can be fitted to most major brands, and it is swank - built in magnifier and sliding-stitching movements are a breeze. With this there are some different technical hurdles. Since there is no shutter on the back, you use the shutter in the lens, or behind the lens if you have the auto-shutter and DB lenses. I do and generally like not having to manipulate the aperture from the front of the camera.
However, you do need a wake up cable to activate the back. With an auto-shutter and its special cable release, the only option is the two shot cable. Flash sync from the lens goes to the cable, cable goes to another cable that plugs into the back that also features a small button. You push the button, then release the shutter with the cable release. Actual flash sync cord plugs into the back. I velcro the two together because otherwise I always seem to be fumbling for the cable release. Of course the Leaf Credo 80 is a CCD sensor so live view is not really usable at all, but the quality is stunning. At some point I want to test out a IQ4 back to just get really silly (or sillier) with the technique. I love the quality those old view camera lenses deliver.
Just for grins - here are links to some quicky test mages using these set ups- I am not embedding them because they are enormous. 300 MP image using the Leaf Credo can be seen at
this link . 500 MP image using the Canon 5DS (including an example of a stitch failure due to vignetting) can be seen at
this link .