What can I do with unusable hot tub to make something pretty and useful?
outside? fountain; Koi pond;raised garden bed;drinking tank for livestock ----- inside;composter,earth worm house for compost? hold plants inside bathroom; put board over it and cushion use as seating area with storage under it.
Can you set up a terrarium in it , cover it with a large piece that extends over the edges to make a large table .
Plant a garden in it .
My advice would be to construct the tree stand and then ask a qualified electrician to wire it up for you. Best to be safe than sorry!