Hi Dan,
That motor mount in the photo? Piece of cake. Go to Lowes/Home Depot whatevef and get a piece of flat aluminum in the width you need. Measure the holes in the motor, transfer to the sheet and drill them out. Cut sheet to length, put in vise, and bend 90°. Motor mount done!
Or, you could purchase the machined aluminum, water cooled, black anodized mounts from Astro since they are back in production:
http://www.astroflight.com/index.php...3jhqn8olutohvv
I have a few AstroFlight motors in my stock, if you are interested.