RE: PULL-PULL conversion on Sig Something Extra
I'd say yes. The pull-pull gives a very crisp response and stays in trim through temperature changes. Search on "Ackerman" as well as "pull-pull" for tips on how to set the linkage up.
It can get to be a "ship-in-a-bottle" rigging tighter fit planes. A jig taped to the centered rudder (and that held straight with tape or rubberbands & pencils) can be a third-hand. I use little steel bulldog clips on a piece of scrap spar to hold the cables tight while I get things rigged up at the rudder horns.