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That car really looks like it has a very big smile on its face! And I bet you are grinning from ear to ear too, TC!
I don't think the garage interior looks wrong at all - It is afterall in the traditional Lotus colours. I fear that if you match the garage interior decoration to the car, then it could look awfully twee - A bit like those matching shirt and tie fabrics of the 1970's. Don't let the tail wag the dog!
As it stands, you have a Lotus garage and you have a Lotus car which doesn't have to match, in my opinion.
[Btw, I am qualified as an interior and graphic designer and also studied architecture]