Hot water tank and immersion, £200, timber, £100, copper pipe, brass fittings and ball valves £200, PID controller, switches and various other electrical bits £100, PVC tube £20, solder flux and gas £30, subtotal £650, £100 allowance for mistakes along the way, £100 for a few oil drums for your settling tank and wvo storage and that's £850. Call it a grand and you might come in under budget which will give you a bit of money for methanol £150 and Kaoh £50. And then you're back at a grand again.
Then you'll probably find yourself upgrading your shed a bit unless you already have water drains and elec.
I could probably build it again for half what I spent first time round, but you pay like that for your education.