Just looking at that laydown bike brings back a painful memory.
In the early '80's, I rode a 1080 injected alky laydown (Spiderman in Seattle) ONCE, foot shifted D&K frame (like the one in the pics) was a little long for me as I was used to my air shifted sit-up bike. I was all kinds of stretched out, but could reach all the controls.
I revved it up, dropped the hammer - and the front wheel jumped strait up, causing the backbone tube to smack me in the chest, knocking the wind out of me. At that point the wheelie bars made contact and the bike shot forward, causing a 'very sudden and rather abrupt' contact between my crotch and that un-padded aluminum seat.
It made me forget all about not being able to breathe.
And if that wasn't bad enough...
I promptly repeated the process in 2nd gear. Doh!!!
I coasted to the shutdown area and made Spiderman ride his own damn bike back.