A company called High Torque brought out low priced fuselages vacuum formed from 1mm PETg and router cut wood parts. I had a lot of issues with mine with missing woodwork, misalignment and inconsistent thickness of the PETg. After slamming it off a few walls it is now a bit more manageable!
Seriously, it is a hard fuse to work with but will be worth it in the end - I hope!

Just an aside, as said before 450 birds are reasonably cheap and plentiful but you would be better starting with a 500 as the range of fuselages for this and 600 size give you a good choice for a scale build.