Excellent, keep up the good work Eric. The engine certainly looks neat enough and seems to run nicely. I definitely think a magazine would take it on.
The two model engineering magazines over here are called Model Engineer and Engineering in Miniature. Not sure whether you've heard of them but I think they would be interested.
I prefer trying to design things myself also. It's part of the fun.
Good luck with the twin cyl i.c. Keep us posted!
Nick