You could get wire/cotton from any vape shop, the bay, or just add some to your Fasttech order, it's about £1.50 a spool there.
You can buy a bag of Muji cotton pads that'll last years for ~£5 from the jungle place, but my preference is Cotton Bacon V2, tried about 5 or 6 different brands, but just can't see past it.
Could get yourself some coil tools like: SKU 7104106 to make life easier and that one has a 2.5mm bit., or go the full road and get a Coilmaster DIY kit V3, it's got everything including 24ga wire and some cotton in it too.
Wouldn't know any other tanks to recommend in the style of the Spiral, there is the Vandy Vape MTL Berserker but don't know how good they are, however, I would recommend getting an rda for home use, my personal favourite is the Peerless SE(SKU 7597301), cheap, super easy to build, holds 2ml of juice in the well and you can mtl if you want too, super easy to build n wick and the flavour/vapour production is superb-for me anyway.