What was the original question?
Welcome to the world of fabricating Bill! Since there has been so little direct replies to your original question let me bring up a few options:
1. Check out Todd Bartrim's RV-9 site since he has already done what you talking about...buying the back of a mount and adding structure to the front that will tie into the Renesis / 13B.
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
2. There also is an engine mount designed by Bill Shertz called the "Shertz beam"...
http://www.jerryhey.com/S-Beam.html
3. Mistral is developing a certified 13B type engine and has been willing to sell individual parts that they have developed to home builders. They sell a rear cover plate I believe will bolt right onto a standard Lord type engine mount.
4. But since you're working on getting a TIG welding currrency hack again, you might want to just jump right in and weld up your own from scratch?!
I wish you lived a bit closer since I would gladly help you regain your TIG touch by welding some AN male bungs onto my radiator and also welding up my stainless steel exhaust system. If you going to do a project like this, a TIG welder and the skills to employ it will really come in handy!
Someone else mentioned it, but if you aren't already doing so you need to drop in and check out the rotary newsgroup list from time to time. There are some great guys on that list with incredible rotary experience who are ready and willing to pass information along free of charge.
http://lancair.net/lists/flyrotary/List.html?Language= I have been on it for 7 or 8 yrs. I think and you can search the archives by topic for quite a few great answers to dilemmas you encounter.
Keep us posted on your progress!
Doug Lomheim
OK City,OK
RV-9A, 13B , FWF, electrical, etc., etc,
P.S. A Navy buddy (Peter Bauer) who flew F-14's a while ago once told me that American Graffiti was filmed in his home town of Petaluma...