Building the Konstructor is very easy, assuming your instructions that came with it are correct. Mine were printed out of order and I had to get proper ones online.
It goes together pretty easily. As Bill said, use a knife to remove parts to make sure they are cleany removed, file off rough edges, etc.
What I suggest is that you've you've assembled it, you take it apart and put it back together again once or twice, that seems to "loosen up" the parts a bit. I had to use some silicon lube on a few moving parts to make it work well. And I took a fine grit nail file and very gently sanded many of the parts edges so they moved smoother.
My experience with it... The viewfinder can be dim and difficult to focus, but once you learn the zones, you can hand focus without too much effort or using the viewfinder. Film advance can be flaky and the sprockets that advance the film will eat thinner based films, so try to stick to thicker ones. It does help a little if you gently file the advance sprockets teeth edges to take off any sharp edges. And the lube above helps inside on plastic against plastic moving parts in the film advance and take up area. When taking, make sure your finger isn't in the way of the mirror release when you hit the shutter or you'll hold it up and the exposure will be off. I struggle with that every time since I hold it and my hand always end up on that mirror release switch. The film counter dial is useless, it just spins on its own, so you will want to try and keep your head wrapped around what frame you are on, when advancing noting the amount of turn per shot and listening for the "click" that the sprocket inside makes when it's reached the next frame. Since the advance system doesn't always stop when it should, you can easily pass 2-4 exposures before you snap a shot again if you don't.
I found that you can make it much more fun by holding filters, diopters etc against the lens when snapping shots. And that the exposure system on it is much more forgiving then most of the Lomography cameras. To me the shots from it are way nicer and brighter then with the Holga.
I really like the pics it takes and I want to try and use the lens on something else with a more reliable advance. I had fun putting it together, then rebuilding to "clean up and fix" the quirks.
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