The problem I'm having is do you CLAMP it in place so it doesn't move while you're drilling. I made the mistake of drilling small pilot holes in the prepunched fuselage but only one is really off a little bit and I don't think that'll be a problem.
But it looks to me like you'd have to use the engine mount as a drill guide, right? And that would require a "T" or "U" jobber bit because otherwise, you have no chance of getting the hole centered properly.
But a T or U is a pretty big piece of cheese to be drilling through firewall, angle, and steel with and, besides, without good clamping, you run the risk of having the thing shift a little bit and then you're really screwed.
I've looked all around and can't find a good way to clamp this thing other than a 2x4 across the front and a long pipe clamp through the recess and clamping to the rudder pedals but that still doesn't give you a firm clamp to prevent it from shifting.
I suppose one option is to drill one corner out to fullsize without using the engine mount as a drill guide, and then inserting a bolt and tightening it down, but will that be enough to keep it from shifting around as you go to drill the other holes -- and now you WOULD have to use the mount as a drill guide and now I'm back to the apparent problem of using a large drill for an initial hole which seems wrong.
Any advice appreciated.
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it was far easier to do it the way i did than to shop for sleeves with specific diamters inside and out..and various different size bolts. there was zero setup error. just a trip to lowes or the ,metal supply shop usually costs me 100$ 
total out of pocket was .00$ and 20 minutes..which is how long it takes me to get to lowes. nevermind the time spent there and the trip by arby's or krispy kreme then back home..shoot man, thats almost a whole saturday. 
i was saving time and time alone. this time it just happened to work really well. 
