I used to shoot flat art for artists, including larger pieces. I used a tripod with a convertible center column, and I also got this T-arm that could be mounted in the place of the tripod head on the column, and the head put on the end of the T-arm. This would allow me to set up and shoot flat art on the floor unless it was very large. I would put two strobes on stands at 45 degree angles from the plane of the artwork, and if the work was not highly reflective, put the strobes in softboxes or umbrellas. If this is going to be a regular activity, they should try to dedicate a space to the setup so it can be kept arranged and ready. Another really good accessory for this process is a bubble level. While any kind of wheeled conveyance for the tripod will make setup faster, I'd stick to the regular tripod feet because it is too easy to roll the stand/tripod past where you meant to in the process of locking it down.