Paul Sage has a trick where he cuts a small access panel in the bulkhead, removes the matrix and makes up a little plate to go over the area. It's all very neat by all accounts and he has a template to do it. (Suffice it to say, he did mine years ago before devising this and it was the remove the entire cabin route that Lee's just mentioned
It might be worth asking Paul as he was telling me at Goodwood that he'd worked out a further mod that was an improvement on this and made life even easier.
Dash out is a pain, if only because you're disturbing things and often the bolts are seized.
I'm just here for the gasoline.