Yep, count me in on that.
I was originally thinking of just adding support to import/export forum output, but now that you mention it being able to also import/export actual (text) files is also a good idea. That way you wouldn't have to use the forums as a middle-man if you wanted to directly transfer your own local builds from one planner to another. Supporting both ways (forum output & local transfer files) would be pretty cool.
That means give me a shout-out both when you're setting up export/import build files, and also when you're setting up export/import forum output.
EDIT: Note that I'm happy to share the binary structure of my save files to allow you to read them directly, but it might be better to use text files as a go-between so you don't have to make changes if I modify my internal structure. (Which I have already done once so far.)