Thanks Terry...
Four years back, I was planning a partially streamlined bike, me lying down like you but not enclosed:
And my engine, supercharged methanol fed 900 side valve Vee Twin lying where your front wheels are.
Since I'm in Great Britain, I needed the bike able to part in two for ease of transport...
After some back and fro with the SCTA tech boys, we agreed a partition design with back to back full bulkheads, each steel and 1/2" thick. about 10 bolts and 6 pin locators...
When the quotes arrived to cut and machine all that, I decided to stick with std motorcycles until I win the lottery!!!!!!!!!!!!!!
All that to say your 5 holding bolts look a touch lightweight to me with so much cantilever up front
Patrick