balsa chassis?

[kwik]

i was wondering if this would work.... i was thinking for my next project (EDF/solid rocket powerd car) i could use balsa wood as a chassis...

but use 2mm balsa wood sandwhiched inbetweens 1mm aluminum on either side (so a 4mm balsa/aluminum chassis)

i was thinking this because it would be light, and rigid? (would it be rigid?) and easy to cut and drill using a dremel?

im not sure how realistic this is, as i havent used aluminum much (im fine with balsa) my budget for the whole car iv set at £250.... and the EDF part is not cheap....

help would be apreciated
thanks
chris