Nice dish Gillham, you will find out that plays real good, will run with the 1.2m CM, or perform a little bit better not by much but it does when you start you're fine tuning. Have the same dish here that I fab on a old horizon motor mount. an they are old about the 1st time I have seen these models was early to mid 80's.
now on the feed legs that dish took 3-legs to a aluminum block, an the legs bolted to the to the dish 1 at bottom, 2 on the side, (should see 1/4" holess on the edges of the dish) an they where made out of metal pipe about 3/4" diameter. so they should be able to be made fairly easy, I can give you how long that they need to be, an also F/L. also the Channel Master feed support, (black plastic) will also work on that dish tried 1 but went back to its metal 1 gave me more adjustment.
will give you what I found on setting mine up here, used a laser pointer, dewalt zip tied to the end of a Channel Master ku feed, an if you will draw a line across in a X patern from its 4 mounting locations of where the mount gos that is where my laser shot to.