Pentax 6X7 right hand grip project.... continued

I've been working on this project for about a almost two weeks (proto-III).  This is possibly the fastest turn around for a project to date.  My original (prototype I) utilized a simple flat washers cut to the correct lug size and then clamped in with screws, but attaching the washers without drilling the washers made for an unstable wood handle.  Eventually it cracked.

Proto II - was essentially the same with the holes drilled into the washers.
Proto III - what is going on now.

The swing latch was a hope to give quick positive locking to the grip.  The swing almost worked, but the mount points for the wood was too narrow and so the strength was to be compromised.

Now a simplified lock plate was cut, however, the mount points would still be tricky and will require strategic cut.  The key to the lock and the placement holes will make this design really good.