There are lots of things you have not thought of.
Most of them are horribly expensive.
When you say loudspeakers, do you mean you are going to need a PA?
If you are just going to make a sketch recording as a memento, you are probably too elaborate already.
I'd just use a portable recorder and a shotgun mic.
If you are going to try to produce a broadcast standard, or CD standard recording, the kit is hopeless.
Why not try to get a local college involved? Music Tech students will be pleased to have an offbeat recording project, and they should be able to borrow pro level equipment.
Some of mine are Birmingham based, but Sandwell, Wolverhampton and New College are nearer.
The repertoire might be a bit limited, The Hedgehog song and a four hour version of Gold,Gold Gold and that's about it!
Cheers
Dave