If it's worth the effort ..... that only you can answer.
My suggestion would be to experiment with anything and everything you have access to. Use blankets, pillows, sleeping bags even the mattress up against the wall.
Get some long mic cables ... have him play in other rooms. See how it sounds.
Might get a good reverb from the bathroom.
What kind of car you got?
Serious .... stick him in the back seat and throw a mic in there.
Ain't nothin right .... Ain't nothin wrong ... it's all about how it sounds and if it sounds good for the application.
Experiment and have fun with it.