Pitts Seat Mod

Gidday, I'm new here. If this has recently been covered I appologise!

I'm looking to modify a stock S1-S fuse so that I can lay the seat back
a little more. I know this has been done before, does anyone have any
experience?

I was thinking to replace the cross tube at the top of the seat back
with one (a bit bigger) approx 2" further back. Then run 4" long gussets
back to the original attach point. This would still mean that the centre
of the tube is outside the original load path, so I'm not sure how big
it would need to be...

Any ideas?

Regards

Martin Morgan