Bricked almost has a good idea there. You want the LV tin cable for the top 40, then a transformer capable of handling the entire maximum input (either an MVTF or an LVTF; it's actually easier (though not cheeper) to build an MVTF) then some proper cable to where-ever... of course you could also just thunk a storage unit at level 88 and call that your treehouse base.
Still needs to /get/ there and build that stuff.