Derp. Thanks.

I got it to boot!

Now I just need to get it to detect the host. I'm using an Apple serial cable from an Imagewriter. I'm going to attempt it again with the IIc Imagewriter option, see if that does the trick.

I tried my 5.25" drive with the read/write toggle that I installed, but it didn't work. I'll have to play with it some more. Hopefully I'll get the bugs worked out on that, too.