I don't have any pictures to put up just yet as this one is going to need quite a bit of modeling time in order to get a few details right. The basic concept is going to be a front end that looks kind of like the Donkervoort except a little more squared, keeping the airflow design they have for the radiator. I'll have a downdraft radiator with fans in a push/pull configuration that blows the air out through hood vents. The engine is a 318ci Magnum from a 2000 Dodge 1500, stroked to 360ci (5.9L). I'm hoping that the air cleaner will fit under the hood so that I don't have to cut a hole for it. The hood should have two narrow vents, like Sondergard and the two vents on the sides in front of the doors. I'm going to have to hunt down a windshield that I can use to model a windshield frame. The base of the frame is built from 1.5" square tube with a 0.12" wall, with uprights and most of the rest of the frame made from 1" square tube with a 0.065" wall. The roll bar will be swept a little further back to allow for a targa top and tie directly into the base of the frame instead of ending at shoulder height. Similarly, a roll bar will be built into the frame of the windshield, following the A-pillar, down past where the front door hinge would be and down through the frame, tying into the base. The two hoops at the back, instead of being two fairly tight bends with a straight section between, will be a more sweeping arc because the back of the Sondergard car is not really flat. Finally, two round beams will link the roll bar to the upper hoop. I would like to be able to either roll down or remove the back glass between the rollbars when the windows and roof are removed. I'll have to think about the doors because when the roof is removed, I don't want the window frame to be there, yet the windows should still be able to go up and down. Rear suspension will be an 8.8" IRS from a 1997 Lincoln Mark VIII and may have to be fairly stiff considering the fixed wheel arches. The quarter panel windows are more or less useless on the Sondergard, so instead of windows, these may be turned into scoops to duct air in for cooling the rear end. Not sure yet whether the exhaust will run out the back or out the sides.
After I make a trip to HomeDepot, I'll start making a full-sized frame mock-up using 3/16" hardboard cut into strips and glued to form square tube. In some places, I'll be using 1" and in others, 1.5" PVC, PEX if I can find it that large. One more interesting element I'm thinking about is circling the cockpit with a 1" hoop. I'm flipping through pages here to see if I can get my terminology close. I'm looking at cutting the front wall out of part O, part of the top out of K1 and K2, the tops out of N1 and N2, and the rear wall out of the cockpit-facing scuttle bar, and welding 1" round tube into the opening. N1 and N2 may be notched, bent and welded to create a curved square bar, which will also act as a guide for building a sill for the door opening.
I'll be using http://www.desicodesign.com/meerkat/Bodywork.htm
for pointers of building a body buck and fiberglass molds to produce the body panels.