Ah - mine has about 3" wooden flat section in the apex - so I just screwed the blocks to it. The mount I had was much more like mechano - rather than a more fabricated mount
I got mine from these guys
eBay UK Shop - Projector-Gear: Extensions, Optoma mount with Extension, Sony Mount with Extension
But i must have an older model - these are more £ than i remember
A few thoughts
- perhaps you could make a v shaped block to mount the bracked on
- make a shelf?
But - firstly watch out for ventilation IN - and heat OUT - with mine - it was the heat out that made it lower than the PJ otherwise could have been
Also - projectors are HEAVY - watch out that you've screwed anything into something solid! I remember being nervous when i let it go for the 1st time
I did wonder whether i should put mine under a table - and "hide" it that way - would make getting the cables there easier - something else to condider (as if you didn't have enough!
Cheers
jcq