you could get away without a lot of the things on that list anyhow.
Swivels are an MOT fail if they leak - but you can cover them up with leather gaitors (a few quid each), and put grease in instead of oil to stop it leaking.
You could cope without the secret box! If stuff is falling out then put a bit of wood in the bottom to cover the hole or simply empty it and remove the remains if necessary.
The other bits are all trivial. The parts are all a few quid and you could easily pay someone in food/drinks to do them in an afternoon or two!