Hello!
You get it constantly, every time you try to fit figures to a model they are not designed to fit. Which doesn't mean that it can't be done. You just have to have some praxis at modifying figs, check the scale often and take into account that humans are, well, soft.
I would like to show you two of my builds wher I fit the figures. Here's one:
The build thred for it is here:
http://cs.finescale.com/fsm/modeling_subjects/f/3/t/146938.aspx?page=4
I have also done it in smaller scale:
The build for it is here:
http://cs.finescale.com/fsm/modeling_subjects/f/16/p/173369/1964991.aspx
So as you see with some trimming and some careful fitting you can fit those babies in. Provided, of course, that the figs are not overscale (you can always measure yourself and compare the dimensions after scaling), and that the model is right (you can verify it too - try to measure the hatch and drawing it on paper - then imagine fitting yourself through that). Sometimes you have to reposition some equipment, ore remove it altogether, provided the figures make it invisible anyhow.
Good luck with your build - be sure to post some pictures! - and have a nice day
Paweł