Resurrecting an old thread, I was given the Konstruktor kit as a Christmas present in 2014, and I consider it to be worth the price my friends paid for it.
I am not the world's best builder of mechanical things, but I managed to put the camera together in a total of 3 hours, over two days (Christmas is a busy time!) and by Boxing day lunch I was putting a roll of film through it. The lens is rather basic and plastic, but the central portion of the image is quite sharp. The focusing works fine and having a waist level finder is quite neat.
If you think that making your own fairly lo-fi 35mm SLR is something you'd enjoy, I really do recommend this. Yes I am sure I could find a better performing camera for the same or less money in a jumble sale, or get lucky at a charity shop...but it is capable of taking nice photos and for me a big part of the fun is making good (or even interesting) photos with such a lo-fi piece of kit.
Not sure about adapting it for other lenses, do bear in mind the aperture is fixed by the shutter mechanism at about f8 I believe, and it has a single shutter speed of approximately 1/80s and "B".
I've put a few rolls of Tri-X and expired Acupan 800 through mine, plus one 200ASA colour film, all of which yielded some nice results as well as a few clunkers. Above all, it is fun.
The two attached images are from long expired Tri-X film in my Konstruktor...the night time one was shot on the "B" setting last November resting it on a fence.
