I have been building forward swept models of various types since I saw Larry Scarinzi's Streak published in Model Airplane News in the mid 50's. I have probably done a dozen or more C/L sport wings, and two kitted Slope Soaring FSW models under the name Toucan ( Google that for information ). I even built a couple of rubber band powered indoor models in that configuration ( All of them flew just fine)
The Lightning Streak (Brodak, Not Flite Streak) was a chance source to build something interesting from a kit I won at a raffle. It worked so well, I built the Black Widow version, and after that proved competitive, I built the final (so far) version, the Sky Streak. A quick search on this forum will yield a lot of information about it, and the ones that have been built by others.
Rumor has it that a huge vesion may surface out east. My lips are sealed....
Small engines and forward sweep are my "THING"!
As far as CGis concered, it is easy to calculate the MAC and then spot about 10% chord. That is a very safe location, and then you can trim from there. There are a few MAC calc programs readily available on the web and they are easy to use. As a final check, I just swing the unpowered model around on a tether, and if it tracks true, rather than bucking, it is close to OK.
This isn't even Model Rocket Science.