I will be adding some coil-over-shocks once I get this on the road. I had thought about adding a connector to the rollbar but I would also want to add something that comes down and and connects to the top of the tunnel inside the cockpit to keep from creating a weak point where the bottom of the rollbar meets the chassis. My long term plan is to upgrade the front and rear to a CoolRydes set up (T1 in the front, TrueTrack in the rear). This is a $10k upgrade I can put off for now but knowing I want to do that later means I should not make the connectors to the rollbar just yet. I plan to spend a good year or two driving this thing and working out some kinks in the mean time.
Not showing in these photos is the spacer plate at the end of the transmission. This has some holes to accommodate a "shelf" that will go over the transmission (linking the spacer plate to the plate on the rollbar) to hold the fuel cell and the nitrogen tank. Not the same as linking it to the suspension system but should help with some stiffening at the centerline.
I need to double check but my floorpans are 18ga whereas ratrog used 16ga. - I know that his is slightly thicker than mine. I did however go with the 2x2 boxed frame whereas he used 1x2.