Building a motor stand-off for an IC conversion to electric- .46 size

[Frank v B]

Am building (assembling?) a .40 size pattern plane balsa ARF from Hanger 9 Hobbies.  It is called the Aresti 40. First released almost 25 years ago. Am converting it to .46 electric, 5 cells.

Needed to build a motor stand-off of about 1 3/4".  Instead of fighting with screws and blind nuts on the stand-off and then bolting that to the firewall, I used a single set of 2 1/2" bolts that bolted everything together.  Surprisingly strong and simple.

Photo steps:
38- built a box out of plywood and wrapped it in one layer of fibreglass and used thinned 5 minutes epoxy.
39- trimmed the excess fibreglass cloth.  The 3 small screws were just there to hold it in place while drilling the holes.
40- added one layer of half-ounce cloth to the existing firewall and added waxed paper to keep it flat and smooth.
41- trimmed the excess glass off the firewall.
43- shows one of the 2 1/2" bolts used to hold everything together.
44- all 4 bolts and motor in place.
45- inside the fuse: 4 blind nuts.  Note: I installed them backwards so the flat side was against the plywood.  It keeps the plywood stronger  because it distributes loads more evenly.  Will hold everything in place with a drop (dollop?) of 5 minute epoxy.

...or you can get Peter to 3-D print one for you.  But what's the fun in that.

Frank