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From initial concept and due to the layout of cab forward design there is very little room in the foot well area a traditional outside frame rails chassis would not allow for any pedal placement and still have enough room to clear front tires scrub radius, hence a custom tube chassis was scheduled for the build and making up a custom space frame.

Majority of the chassis is build using 2x1" and 1.5x1" 0.120 wall square tubes with 2x2" and 0.186 wall for lower rear rails and some smaller tubes triangulating main tubes.
Chassis is divided into 3 distinctive sections, front section, mid cabin area and rear engine compartment. There is a separate A pillar and windshield frame that bolts in to the main structure which has the the cowl/windshield frame surround body work bonded to it. The chassis has all of the provisions to bolt body panels right onto it via welded in machined and threaded mounts into the tubes. More on that is in the body-mount section

The front has a fully seam welded 18ga sheet metal between all the chassis tubes making up a weatherproof box designated for luggage compartment. The 2 vertical rails extend past 10" to front firewall making up space for mechanical components like steering rack, brake booster, wiper regulator and windshield washer and few other misc components. To stiffen up the rails, they are triangulated to the center section

Rear part of the car is strictly engine/drive train compartment. Along its length are 2 parallel tubes interconnected with triangulated tubes with one additional sloped tube running from top of roll bar behind the seat to the back which is used for mounting quarter panels and rear deck hinges. Most of the tubes are filled and fully welded with 18ga sheet metal with some clearances for shafts and access panels to battery and other mechanical components behind it. It is also triangulated to rear firewall behind the seats with additional X brace between upper parallel tubes to which upper control arms and suspension are mounted to.

The center interconnects front and rear sections via center tonou that is made up of triangulated square tubes which again are claded with 18' fully seam welded sheet metal on all 3 sides and on bottom a skid plate is bolted up from bottom covering fuel tank running along its length. To provide additional strength and protection there are 2 parallel tubes on each side within the rockers running from front wheel well to the back firewall which as well are sheet claded and fully seam welded with 18ga sheet metal. Bottom tube runs past the rear firewall all the way down to front of rear wheel. The tube has welded in inserts which are threaded  and are used to mount the rocker panel and filler sheet to make bottom of the floor smooth and preventing any road debris of getting onto the hidden chassis and also protecting plumbing hiding within the rockers. Floor of the cabin is covered with 14ga sheet metal to protect the occupants as it will be 4" from the ground at speeds.
Some pictures are with in the chassis gallery

Sheet metal panel fills
We have decided to use 18ga cold rolled sheet metal for most of the surfaces with exception of the cabin floor as we wanted to make sure that is not flexible for when a person stands on it and secondly when a debris on the road get picked up and gets hit it would not go through the floor.
Most of the panels are fairly simple and flat, some that do have bends in them are fairly small which where bent at home with home build bender. One exception was in the front trunk that was bent up at metal fab shop and cost a lot more than it should have. this was unavoidable as it was 36" wide.
Floor though being completely flat 14ga sheet it does have cross braces which are used to mount seats to and in turn are welded to the side rails and spot welded to the floor sheet.