well... i really dunno if i expand the budget if the tube frame the decided one.
but after spend many hour exploring data about tube frame and other type of chassis, tube frame is the rigid and strongest one.
Here is my prob : The original body is a monocoque frame is it? ( this is a bit crazy about autos things, for my background is a fine art concentrating on comics, illustrating, and graphic design...
) My method is to put the whole new chassis (round tube) into sigma's body. This means,:
- i'll have to chop up the entire floor which include the backbone of a monocoque frame.
- the remain bodies will be installed into a new chassis. Side bodies will be bolt up to the inner side of the body (should i say inside panels?, this is a lil bit confused for i want the car to be a lighter weight), which is bolt up/ welded to the tube frame...
my Q is : will the body strong enough to hold the pressure of the car?/engine? or even the wind bumps?
i'm new to the autos engineering world, but i always love the look of a classic car, and also the speed... so i promised my self to build a classic car..no, a classic sport car. Now i have this Sigma, and i have a chance to make my dream come true...
i'll attach some of my illustrated sigma on my post later ( after learning on how to upload a picture of course...hehehe
I think you guys have seen some example of a classic car restoration using methods like i said.
once more, sorry for my english....
yore build sounds very expencive but intresting too. 
is it gonna be full tube chasis or only front half?
