RudeB........

After mounting the engine to it's mount and removing the carb, tilt the engine in nose first.

Tighten the four screws to the firewall using a long thin phillips screwdriver. There's enough space between the purple drive washer and the cowl to stick a long shank driver in. 'Course, you can always remove the purple drive washer and gain much more room, making it very easy.

Be sure you break off the engine mounting bolts beneath the lock nuts before slipping in the engine, so the screwdriver shank can go in without hitting them.

The carb can be tightned using what we call "ignition wrenches". Very small combination wrenches (spanner) that come in .5mm sizes. I think the carb nut is 5mm.

Let me ask you a question..........
I'm going for a CG of 135mm measured from the center of the wing's most forward part, its center, where the dowel is. That required placing the battery back in the fuse beneath the elevator servo. Does that sound right to you, to place it so far back to get 135mm CG?

ArthurR