I like tiles...but I have to admit that Intellijel format tiles are nowhere nearly as diverse as the original Pulplogic format. You could build a rather uncomfortable to use but technically complete modular with those; not so much with Intellijel format stuff.
The big question is what, exactly, are you trying to do here? What about the Grandmother needs expanding, in your opinion? How would you go about doing that? What size build works...and what size works BETTER? You need to be asking those questions, and not whether you've got the magic number of VCAs. Right now, this seems like it's targeted at one or two aspects of the Moog, which begs the questions above.