well thats pretty easy for us...
i dont know how accessable your rear door space is?? because wouldnt you be able to model the exterior dimensions off your rear door?? they should be identical....
when it comes to the dimensions of the subs and the 'called for' box dimensions i could easily send you the sub instructions that include the 'called for' information....and the cardboard box comes with a cutout to the exact dimensions of the sub to aid in box making...basically little templates...
and when it comes to shipping it should be around $50-75...when i shipped my rims they weighed 77 pounds a piece and the total shipping for 4 of em was around 130....