Tigerdude, don't worry so much about the little details...

Usually kits will reccomend a range of engine sizes (ie: .15 to .25). Anything within that range is fine, but I always lean towards the upper end of what is reccomended(if not higher). You can always decrease the throttle if it's too fast/powerful, but you can never squeeze enough power out of an engine that doesn't have enough power. You never, ever, never want an underpowered airplane, ever. That Mag .25 would be perfect! Clean it up and install it. [sm=thumbup.gif]

I wouldn't worry about that break away plate, props are (relatively) cheap. Buy lots of 'em - you're going to need them. Just mount the engine straight to the engine mount, no need to add/change anything. As far as what the plans/instructions say, that's just as an example. Any mount engine combo within the suggested range will work, many times the mount will fit several different engine sizes. (GP adjustable mounts are good, if LHS has them)

I don't have much to say about pushrods, except stay away from the EZ connectors for primary flight controls(rudder, aileron, elevator). They're ok for throttle. Problem is that they have a tendency to "slip" over time, unless you're real careful on the installation. Not worth the hassle IMO. Other than that, use whatever works.

As far as covering, there are some that cover before(like an ARF), and some that cover after. Only way to find out what you like better is to do both, then decide. Filler blocks can be done if temporarily attached, sanded, then removed and covered, then reinstalled. Not sure it's much of a time or effort saver on this one though. I'll think that one through when I get mine started. Not too difficult to do when already attached... If you get stuck, give us a yell, and we'll throw a dozen suggestions at you.

Hope you feel better soon!

BTW - balsa dust is really, really bad when you have a cold or flu. Hold off on any sanding until you're better. Trust me(experience).