I've played around with concepts like this too, using a mix of leather and kydex. But...what I found was, I'm a modern eye-level shooter even with old-school guns. So I want to do a draw where I launch the gun up to about nipple to mid-sternum height and then start rotating outwards to fire. In this style of draw a lot of the outward motion happens as the gun is at eye level, so you're picking up the sights at the same time you're prepping for fire - and if the issue turns out to be bad-breath-range-close, great, you fire faster than that.
So I've gone to a very high-ride crossdraw setup, dancing on the edge of "shoulder holster" territory. Still pics are in the middle of the video: