ORIGINAL: Teepers
I could probably secure the sullivan push rods where they exit the fuse and again about 1" from the servo's. Would that be sufficient? The fuse is solid so access to the interior is difficult.
Not really. You're going to need to brace the pushrod tube in the middle of the run down the fuselage, otherwise you will get flex in the pushrod/control surface. Since using a flexible pushrod with a guide tube isn't practical in your case you might want to consider a fiberglass pushrod. These are similar in construction to your original pushrods but use fiberglass instead of a dowel rod. The are lightweight and very strong, and I've never seen one fail. I've got literally thousands of flights on planes with these type of pushrods and I've never had a lick of trouble. The link provided is for Dave Brown pushrods, but there are othe brands that work to. These work well for you because you can get them down through the fuselage with no problems.
[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXB901&P=7[/link]
Hope this helps
Ken