Thanks!
Yeah I know about the different files and such and this one is such a complex branched one, a beautifully programmed one. As for the sketchup API (toolbar, command and menu) I'm not 100% fluent yet, but getting there, already fixed many plugins.
The thing is it seems to me that it's a difference in file behavior from the PC to the Mac, as if I understand comments made it behaves properly on the PC (looks in the plugin folder) but doesn't seem to on the Mac. Since Jim wrote it for PC there may be a quirk on Mac for which there is a way around that someone had already encountered.
Of course I won't hack without backup and protections and what not, and without understanding the behavior of the original program, but I can only imagine what it does on a PC and see what it does or doesn't on the Mac.
In this case the program and the UI work great.
OK I know you're right I'll do more homework! Thanks for the links.