Could you bolt the beams to the engine first, then glue them in place? Maybe make an aluminum "placeholder" with holes spaced the same as the engine mounting holes? Haven't had my coffee yet, so this may not work. . .
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I'm a soft mount fan myself. Why beat up the airframe that you put so many hours work into?
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ORIGINAL: NM2K
. .<snip>. . It is difficult to get two separate wooden beams on the same plane so that there is no twist applied to the crankcase when it is bolted down. . . <snip>. .
Ed Cregger