I vote for AnyRail. It is a simple drag and drop program with a library for all track manufacturers. There is no learning curve as with the CAD programs. And it supplies part numbers so you can really transfer it from paper to benchwork.
Thanks for the info. It would be nice if KATO had more to offer in their HO scale line as they do in N scale. I'll experiment with the cork and solder method.
I am in a similar situation in that I am using both KATO and Atlas track. I've looked at the KATO accessories and do not find any adapter specific to this transition. Could you mean that you are using the rerailer for this purpose and cutting it to fit to replace a section of track? It would be...
Atlas makes transition joiners for code 100 to code 83. Here is a link.. http://www.1stplacehobbies.com/track.asp?sc=H&mfg=150&keys=transition&walthers=&sp=1&cp=1&lid=0