Thanks all. A good discussion. I am still on the fence with "modifications" like this. If it's done by a LAME or someone with the approval, I don't see an issue - But I don't write the regulations.
I was out again yesterday and had a Pax. A mate who is a bit larger than me, and I made a note of what problems I faced when wanting accurate readings on the engine instruments, and I will stand by my claim that having to lean over in front of him in flight, surely can't be better than getting the instruments on an angle.
I REALLY hate the attitude of "LSA pilots have been using a flat dash for years" as an excuse to sit back and not look for a better way forward. Seriously... Are we that old and stubborn that we can't look at something and improve it.
Anyway.... I will put up with my dash the way it is, and fly and be happy, but I still think an angled dash would make for a nicer experience for me in the cockpit.
Just my 0.2.