4x5 is fun, and cheep too. Something larger sizes can't claim is they are cheep. You can enlarge 4x5 for a cheep cost. Enlarging 8x10 on the other hand is astronomically more expensive because those enlargers are room size. But you know that already... I only bring that up to shine the light on eBay. eBay is seasonally good with the options on enlargers. They appear and disappear from week to week but the fact of the matter is nobody wants to spend to get them shipped, so they generally go for cheep price on eBay (shhhhhhh! don't let the secret out!). So if you look in your local area, or limit it to a few hour drive you can likely score big time for a cheep price. I bring this up because I don't think the 23C provides enough room for 4x5 honestly but maybe it does. It just seems too small, to me. Not to gloat but I got an excellent Omega D5XL with the color head, turret with 3 lenses, two diffusion light boxes or whatever they are called one for medium format and the other for 4x5 and I got negative carriers for 6x6, 6x7, 35mm, and 4x5 all for like $175, on eBay. Had to drive 4 hours to Los Angeles and back. There are deals like that, that will make you forget the idea of modifying a medium format enlarger. It only takes a little diligence to keep checking.