Ideas, and creating a "CAD" tool

During a meeting at work I had a couple of ideas: underwater helicopter, jet engine driven boat, remotely controlled snow blower on tracks. Thought about lighting ("required by law": white top, white aft, red and green for port and starboard; search lights front and aft; "effect lighting" like 3 blue LEDs or so), air supply (but how to prevent water from getting in too easily), mast for compass sensor and lighting.

Changed the plug on the 12V mains adapter cable, and the plug in the computer box. Wrote BowCalc to calculate the bow measurements bases on four slider values (alpha, beta, width, and height).