I tried an almost similar project some 20 years back. Main difference was that I installed an Enya .09 (an old one with the exhaust on the opposite side to today's engines). So that you may profit from my errors, here's what I did.

I installed maple bearers with 1/32 ply extending back on both sides to just aft of the high point of the wing. This extended 2 1/4 inches in front of the wing for mounting the engine. Clearly there was insufficient room between the engine and the leading edge for installing a tank so I placed this inboard from the engine. A wheel was installed close under the engine. This mandated hand launching but would allow dead-stick landing. I figured that this engine & wheel placement would allow the fuse to remain at the original length without having to add a ton of tail weight. Minus engine and tank (but including a fuse repair) it now weighs in at 6 1/2 oz.

Though it flew tolerably well on 40 ft lines, I'd not say that it was a resounding success, never tried longer lines. I mentioned a fuse repair. I don't recall detail on exactly how it happened but the fuse did break at the rear of the wing, directly in line with the tapered trailing edge. Possibly some error when inletting for the wing.

Best of luck.