4ground - Take your time, go through instructions, then dry fit 1st before gluing each stage. Also check to see what may be coming at other stages, as it can have an effect on how you do each stage.
Some parts are very fragile, door hinge panels etc.
Use either Super Glue or PVA. But remember the glue has a thickness and so may, I say may, effect the fit of some parts. Use elastic bands and bulldog clips.
The edges of all laser cut parts are not square, when the laser cuts it has a V shape profile. This can effect how well things sit. Use a 90 degree piece of scrap to keep things at 90 degrees. Just means that if other parts, walls and floors are to 'slide' or fit in they will have a better chance.
If still not sure, buy a really low cost kit from anyone who catches your interest. I would shout for Sarissa.
Its no more complicated that a plastic kit.