So, I guess thanks to some dork we're all on our own with the overlays. If anyone has an idea of what to do with them I'd appreciate sharing of sizing info'.
A lot of work to do, especially as I have little experience with such things, but dammit I want my Vectrex with overlays, so I'll work for it. And if eventually I get it done (maybe by autumn) I'll post the lot on here.