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If you reverse your receiver and receiver mount ,plugs face center of car in front of fuel tank, you will have much more room and better protection.
For play four wheel drive is much easier to drive than 2wd,no noticeable speed diff as a 4wd becomes 2wd when the rear tires overrun the front one way.Really the front wheels only drive when the rear are slipping that is why you can run a solid axle in a 4wd car to get more steering.
Mugen japan still lists on their website both a parts breakdown and promo for the avance.Have seen that kit sell with an econ 15 3 port for around 200usd. You will pay considerably more for a serpent plus buy the engine. That said it is an excellent car.