Im from Saint-Petersburg.
Interesting start project on my roof.
Size of roof: 16000mm x 10500mm
Strange: cold winter, expensive prise for XL. Big size project.
Made local all details
Customisation? big size 10 000 mm x 10 000mm idea + polycarbonate roof and secondary heating from the ventilation of the house
Sounds fun. A few have speculated on larger machines, im unaware of anyone who has actually built one though.
My current preoccupation is with stainless unistrut rails, powered at 17v from solar, the bot moves along the rails with `notched wheels that fit in the gaps.