Thanks, bit conflicted about it TBH, it's primarily/initially a weeding robot, although I do dream of expanding it to do harvesting, and yes potentially sowing too down the line.
I sometimes help out at a hobby vineyard of 0.7 hectare; weeding in the row is a lot of manual labour. Your platform seems like a good fit. I like tinkering and robotics, what kind of price point are you aiming for?
a simple ride on mower with a diy inter row disc (basically just a belt and pulley with a spring) may be enough. probably just get sonebody with a tractor and inter row disc weeder to do the job for you.
What's the plan for using an engraving laser in open air without blinding a neighbor? Does the bot fully roll over the target area before firing or something?
Strapping something like the Jang P6 to it is probably feasible https://reagtools.co.uk/collections/jang
For the harvester it would be a bolt on for https://reagtools.co.uk/products/quick-cut-greens-harvester or maybe https://reagtools.co.uk/products/babyleaf-harvester-80cm (I grow green salads)