Yep, that identifies the version...

The original Ringmaster from Sterling had one spar, about center height in the ribs, and a milled "D" section leading edge piece (also notched for the ribs.)

Not a great matter for your intended use. If you really get into it, and take up Old Time Stunt, this one wouldn't be eligible. It came out way after the original, which was from 1952 or so. The sheeted forward surface and spars may make this a better flier and more durable than the original.

The original Sterling kit didn't have plans showing side and top views, it was more like an extended cartoon strip, with lots of words, showing how the assembly steps went. I don't recall info in that kit on CG location, but you should be good with the ENYA 35, which is a bit heavier than the usual Fox 35. If it balances about an inch back from LE for starters, you should have enough stability. If it doesn't turn well once you get used to it, , you can add tail weight a bit at a time to move CG aft, while keeping it usefully stable .

Think in weights like two or three pennies worth, not whole ounces of metal. When the CG is at optimum, a straight, reasonably light Ringmaster is a lot of fun to fly!

Enjoy!