I have a LA 62 that I finished recently and i am using an OS 91 Surpass for power. I think the firewall may be a bit narrow
to fit a G26 but I am not familiar with the mounting requirements for that engine either. You could widen the firewall and fuse
but that would create other issues with the upper wing mounting etc.
I think the air frame would handle the power of the G26 ok but if I were going to a gasser Ithink I would look at the next
larger air frame which I believe is the 76" version??

Sam