Doc, that case sans lugholes is the closest you're going to find. It's not that big of a deal to drill holes if you have the tools for the job.
The critical part for a "Bond" Sub is the thin case. The gen's rehaut is very very low, and the crown sits in the middle of the case, when viewed from the side. Like Freddy said, the Big Crown Bond (6538) uses a slightly thicker case, but if you go that route good luck finding a crown. It will be easier to build a 6536 for that reason alone, then you want the thinnest case possible, and a low domed crystal. The Silix case is best for overall shape, but the gen crystals don't fit. Plus the Silix case has a relief ground in around the crown, and that really needs to be flattened away to look right.
It's a big task you've taken on, good luck! Here's a profile shot for you.