pacific models gee bee-Y arf
Dan,
I have some RCS 140 engine mounting pictures in the GBY section of my website below, along with other general assembly and "as it came from the box" pictures.
I was able to use the included mount, which appears to be the same as Hanger-9's "Ultra Engine Mount", and did not need to really modify the firewall at all. Drilled two new holes for the blind-nuts, which you have to do anyway, and made a pair of 1/2" standoffs out of 1/4" birch-ply. There is a lot of leeway in engine and ignition system placement.
Should be ready to fly by this weekend sometime (assuming all the parts I'm waiting for get here). Keep checking the website, I'll update it with additional pictures as I go.