Welcome to the forum. Nice project, love the coupes myself. I take it the wheelbase is correct and the frame doesn't need to be cut or modified as far as that goes. From there it is simply a matter of identifying the mounting locations on the coupe body and identify what kind of feet are needed to make mounting points on the frame. I know from experience the frame is pretty flat between the wheels and plenty to weld or bolt to. I think it was Rod and Custom or Street Rodder (most likely the latter), that changed a frame on a '50 Ford about five years back, it showed what was required to get the body support points to work and did not look difficult, but it is still a bit of work getting them in place, tacking them, fitting things, then removing the body one more time and final welding everything. I would think supporting the body by hanging it from above will allow you to lower and raise the body and not have to worry about any supports being in the way so you can move the frame as needed to get these support feet in place. Nothing is harder than having the body supported on the ground and having to work around jack stands or trying to raise or lower the body to check the fit. If the body is halfway dismantled (hood and trunk off), you can use the hood attachment loctions for the front hanging spot (bolt and plate and chain/rope to hold the front, trunk hinge the same way), then come-along or some other form of lifting device to hang the body from above, this way you can lift and drop front and rear independently. They do make the foot brackets in different lengths, universal, otherwise try the stock ones or something similar in design for strength/appearance.