As others have said, the "modular power unit" is most likely a "power cube" (in OSE terminology) [0]. From the "Product Ecology" section, it looks like it does enable the tractor, either through hydraulic or electric power. It looks like it's able to use gasoline and steam though not battery technology (LiPo, etc)?
If you were able to cheaply apply the upgrades you're talking about (safety glass, lights) for some nominal fee (maybe sub $500?) would this a viable alternative to other options? How many "quirks" are you willing to put up with before you throw up your hands and go with a more commercial option?
If you were able to cheaply apply the upgrades you're talking about (safety glass, lights) for some nominal fee (maybe sub $500?) would this a viable alternative to other options? How many "quirks" are you willing to put up with before you throw up your hands and go with a more commercial option?
[0] https://wiki.opensourceecology.org/wiki/Power_Cube