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An alternative to two engines - one engine and a flexible drive!!
I removed the outer part of the flexible drive and the drill chuck as it is to heavy, I am sure you can work out the method of the bearings in the clear plastic tube from a DIY store, engine end of flex drive is soldered in , other end is ground slightly flat to fit into a slot as sketch, this is so that the engine can be removed with the drive for lubrication and maintainance. If the outer tube is fed through holes in the wing ribs it will not move.
We made a new conrod with a wider bigend to drive the rear crankshaft.
The space area left in the crankcase should be as small as possible to ensure a good pressure when the piston descends to inject fuel up the transfer port. A 2 stroke has a much better power to weight ratio than a 4 stroke given the same capacity. I think to drive 2 props off one I would increase the engine capacity by 50% above that recomended for a model using one engine, ive found about 20 to 25 ouces a square foot wing loading allways works on a model of about 72" span, but use props slightly smaller dia, one has to experiment to get it right. The photos are not very clear but will give an idea. I've run the setup for an hour on the bench without any overheating or problems it is now installed in the wing so cannot photo again. These are my own theorys but I think more qualified people than me could improve the system, its not a new idea just my version.