One of the breakthroughs in our design process was discovering we could use the strip heater at Techshop to bend the acrylic. It made the design much more fluid and helped reduce material costs.
We were lucky to have the strip heater available to us. For many of the home builders, it doesn't make sense to buy the expensive tool for such a nuanced use. Not surprisingly, some ingenious members of the OpenROV community have devised ways around it.
Sliptonic is going for a square cornered design that uses separate pieces of acrylic.
Dominik just posted his attempt using a soldering torch.