I’ll bite -
Benches and arbours (wood and concrete block with bark mulch and (free) used brick paths: $400
Potting and Wiring area (wood deck, work bench & shelves, turntable and overhead heater): $500
Tools and supplies (bonsai tools, shovels, saws, dremel w/ case and bits, shade cloth, sieves, grow boxes, baskets, hoses, wands, auto- water system, probably a million other things), I’m gonna say: $1500
Trees, pots, ferts and soils are ongoing expenses, but maybe to date (I’ve been doing this for 5 yrs): $1200
8x12 Glass greenhouse: $9000
Koi pond (lol): $10,000
Did all of the building work myself and a lot of things were scrounged for free.
Total: $22,600