This stand-off issue really had me going.

But this morning I am thinking - Hangar 9 Mustang came with 48mm stand-offs for electric. But I fitted a gas engine! Then there must be somewhere in this house 4 stand-offs. After an hour of searching found them in the roof still bagged up.

Simple job to cut out four 20mm bits and drill out to 4.5mm for 4mm set screw clearance. Motor mounted, cowl position set and fixed. 2mm clearance between cowl and spinner backplate.
The qefimagazine electric review isn't that helpful as such, more of a skimp through. Jon's build/review much more helpful.

although for glow.

Since these models were reviewed, some changes at the factory have been done. The snake tubes are already fitted. There are four now, two for elevator rods and two offset for pull pull rudder. The single rod to rudder is discontinued. However to get a decent pull pull arm in to match the rudder horn width I have had to put the rudder servo where the throttle servo would've fitted.
The pull pull wires will now go under the elevator arm as per the original build instructions.
Getting some decent progress now, not rushing but taking careful steps. Tomorrow I am planning on glueing the stabiliser (dry fitted and looks good). Glueing the wings too, then I can work on the flap system.