Thank you all for the compliments and observations.
My main motive was to explore possibility of fundamental bulkhead redesign while keeping it in compliance with FIA regulations.
Crash test is what worries me too, the best I could thought of would be adding third longitudinal central structure, a bit thicker than ones on the sides.
When it matters chassis packaging, the steering rack would be at front, with braking cylinders and braking fluid canisters behind it - accessible trough usual apertures for suspension adjustment.
Someone mentioned suspension too. It would require low position of suspension arms, just like on 80s cars, and two struts for lower arms rear attach point. It would still be push-rod system though, but with dampers laying flat as on early 90s cars.
I know it would requires a bunch of redesign, but it is just an idea, not a task for anyone.
BTW, if noses can't have any openings since 2009, does it also mean that there can't be even the driver cooling opening? If it however can be, than what is the difference in what equals tubular nose in both cases, apart from diameter of entry and exit?
*the chassis rear end shown on the pics is the obligatory 450x450mm section.