Convert your motor mount/front of airplane to beam type, Like a big Flight Streak.
It already has beam mounts.
So presumably when the old kit specified up to .099 they were talking about an anemic .099 engine. Similar to my big Flite Streak which is designed for .19 to .35, I have a Fox .35 on it (because I had one as a kid) but if I were to use a modern engine it would be a .25 probably.
This is one of the best flying 1/2a's going!
Good to know!
Well then, I'll use one of my TD .049's on it. I have 5 of them and an .051 also. I better start building!
Mike