I have been thinking about an ROV for a while, joining this forum, and purchasing parts has moved me closer.
Living in a Narrowboat I have a fair amount of access to 3 / 4 meter deep water, but my interest is in going deeper. As an active member of my city's hackspace I have access to the 3D printer, and the Lasercutter, and being miles from the US makes the purchasing of the kit expensive.
I have chosen to build my own pressure vessel and ROV hull from materials I have access to. I have taken measurements off the laser cut files, and design ideas from Ion.
If you could have a look at http://skippy.org.uk/openscad-openrov-design/ I would appreciate any feed back and thoughts people have.