hey mate good stuff. my 2 cents.... i reckon that cut was way too short. i got a gq ute and my guess is that where you chopped on that seam the other side of that hump on that seam would have been the go. looking off the handbrake grommet hole i'd say about another 6 inches would be the wall :DD
This will be shorter than a standard gq ute but more room than a standard g60. There will be a small sacrifice but it needs to be in proportion also. Well fingers crossed anyway
I've had the conversation with the engineer and its not required but its something that I think I'll incorporate. Has to be completely concealed by internal panels or roof linings though.