Following many issues with controlling 12V strip, I had to re-evaluate the feasibility of it... coupled with some discussions about flexibility, the project has morphed into a series of pixel panels, these will be usable in a domestic environment as well as in a field, using a series of 6 8x8 panels, I will have space for 8 standard letters, and of course, animations.

I knocked together a prototype of 2x2 pixels in an hour and it turned out well, visible indoors, and outdoors at dusk/night, it works rather well.