get this:
http://www.trademe.co.nz/motors/car-parts-accessories/austin-rover/auction-411455284.htm
cut off the roof. afix to an avenger estate body. twin headlight conversion too, while you are at it.
you win.
if anybody actually thinks this is a good idea - possibly because it is - then i can go make some measurements. i can say on good authority that they are pretty much the same size.
oh and also i need the rear lights. and bonnet. and dash switches [sedans are smaller and dont fit good]. and so on. :)