Impressive! bigmessowires, I'm lurking your progress here and on your blog since the beginning of this project. All of this is awesome! Incredible!

But I must say that, imho, a read/write floppy emulator make more sense to me. Your read-only prototype is already unbelievable (as is all the Plus Too project), for sure! But a mean to get data easily out of our old Macs without having to mess with floppies / external hard disks / Zip / LocalTalk or whatever seems a must to me!

Again, I'm not the guy who'll design it. But if it's feasible, along the Plus Too, I would say go ahead with read/write!