Charles,
I don't think you'll have any problem with the weight.
I wouldn't want a G-45 pulling it around.
I've got a G-62 in mine.
You might extend the engine out a little farther to help on weight.
Since there's no spinner, an extra wide gap in front of the cowl isn't going to be noticed.
I'm not sure what mine weighs: probably around 28 lbs.
I've seen lots of heavy warbirds fly with no problems.
Just make sure you have high oz torque servos (at least 94, I go with 133 with 6 volts).
Also, no floaters on landing: come in with flaps and fly her to the ground.
Here's video of me landing my spit:

http://www.rcuvideos.com/item/VSVT2H7ZH7Y5DT35


I guess I should mention taking off too: make sure you've got flying speed before giving up elevator.
You'll need 75-100' of high throttle before giving any up.
(That 100' isn't total length on the ground but after you've given it full throttle).
If you start to veer to the left or over compensate on the rudder and veer off to the right, shut her down and try again.
I'd rather 'look' like I'd don't know what I'm doing than take off too soon and 'prove' I don't know what I'm doing.
You can get away once in awhile taking off too soon but the balsa gods are waiting and, sooner or later, they'll win.
Too many pilots seem too quick to lift the plane off the runway before flying speed is attained and then want to get high at the risk of not having enough flying speed that you get at a low angle climb.
(when I mention plane, I'm talking about large warbirds only)
Here's the spit taking off:

http://www.rcuvideos.com/item/6VRHKB0W8Y9MDBFG