Hi Paul,
I've been looking at the homebuilt ROV crowd a bit for ideas as well. You are correct, there is lots of usable info in this area.
Have you seen this one? http://www.videoray.com/?referrer=adgoogle
Not a homebuilt, more for commercial applications but, quite cute and nimble. It's a fine example of miniaturization of systems.
Joe
From: "Paul Kreemer" <paulkreemer@gmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Autonomous underwater vehicle on Instructables.com
Date: Thu, 6 Jul 2006 20:43:12 -0700
Neat little semi-autonomous ROV. I thought it was worth sending because it includes a fair number of photos, parts list and wiring diagrams.
http://www.instructables.com/id/E7THM8MY2UEP286QU3/
Paul