So I did due diligence and searched here for ten mins at least, no luck. So, I am a bit out of order in my building as my workspace is very limited, until I move the project to the airport, I am unable to put wings or tail feathers on. Canopy has to wait till summertime temps arrive. So, I would like to move on to hanging the engine and firewall forward stuff, but hate to seal it up and lose access to the forward section. I see pictures here and there with engines hanging and open and unriveted on the other side of the firewall, where the F-771 forward skin lives. So it can be done, I am wondering about any concerns I cannot visualise by moving forward, working forward of the firewall and keeping access open to wiring and such on both sides of the firewall before sealing that forward top sheet?