Depending on just how much work you are willing to do, I have found the Easy Built rubber models easy to convert to CL or RC, especially the 50" warbirds. www.easybuiltmodels.com
Some extra ribs, adding control surfaces, some planking and good beefing for the engine section and wing mount area. Great fliers.

In addition almost any RC kit can easily be converted to CL.

Check out Flying Models magazine for many good CL plans. (no link on this computer -- away from home for 2 months.)

Good Hunting!