The MM trick is set up a piece of plywood to act as the firewall.
   Prefab the firewall fittings and the rubber holders.
   Locate the rubber holders in space and cut, fit and tack weld everything.


   BTW how many people on here can weld steel?

   Paul Lamar


   I do. Are you interested in doing mounts for other people?

   John

   I would be but, 1) I have no credentials as a welder and 2) I'm in Canada
   and the border might present some complications. I thought someone was
  doing
   mounts and had jigs and everything ?

   John

   Jerry Hey retired from making mounts due to eye sight problems.
   Me and a lot of other people miss him I am sure.

   Paul Lamar


  Do you have any pic's of Jerry's jig ? I would be interested but I think a
  good universal jig would be really important.

  John

  Yes here are some pictures.
  Jerry is pointing to the the prop flange point where he can
  set the off set angle of the engine. Generally my designs incorporate
  an adjustable rear mount so the down thrust angle can be set.

  I'll work on a 3D that incorporate the best of these ideas and
  that can be made mostly out of plywood or particle board.

  The vast majority of the mounts are 39 inches from prop
  flange to vertical firewalls.

  Paul Lamar

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This is an evolution and simplification of Jerry's design.
It is just a 2 X 4 on top of an adjustable column.
It could be replaced by a rectangular steel tube.
The column is made from telescopic 2 inch and
1 7/8 inch OD  tubing with .0625 inch wall. The larger tube
is slotted on the end so it can be held together
with a hose clamp. The red pin is the pivot for off set
and it is ten inches from the center line of the motor
plate. The column is mounted on a 2 X 8.

The base board can have different hole dimensions
from the firewall for the red pin. That moves the engine
closer or further away from the firewall. The firewall
is fastened to the base plate with a piano hinge to
allow angled firewalls.

The base board
and firewall are 3/4 particle board. Perhaps
covered with galvanized or 304 SS sheet if you want to
get fancy.

This design has evolved over a period of
11 years. I made the first jig for my KIS motor mount way
back. Last 3 pictures. It was hard to weld as all that
bracing stuff got in the way.

Paul Lamar