Beavertail, I might be wrong but isnt the 1.08 much bigger and heavier than a YS 91. It flies great with a YS 91. Not hover league though but plenty vertical for me. If I am correct about my recollection of a 108, that engine may cause the airplane to be nose heavy, but again who says it cant be done.

Some times ago I read a post somewhere from a guy who had installed a 1.08 in the 66 inch version. Well I guess this guy flew it stock, no wires or fillets, without regard to the added stresses and blew his tailplane right off during a power dive or something. Now, I do think this airplane could handle a 1.08 as it is built tough but I would definately reinforce the critical parts, especially the tailplane and firewall, and take it slowly. After all the airplane is designed for only 70-90s as per their instructions. But you sure would have a rocket.