Kit you are looking at is a solid Alder body though it looks like it is made from more pieces than a box of matches.
You could do it a bit at a time. Buy an unloved "orphan" from Gumtree or Cash Converters. Take it to bits, clean it, re-assemble and set up. Then get a reasonable body and finish it how you want. Then transfer the bits over to that body. Next upgrade the hardware, as little or as much at a time as you wish. Some time later get a quality neck. Fit that and transfer the hardware over to that. You can steadily improve and manage the cost until a year or so from now you have a quality instrument to your own specification.
When I built my Tru-caster I had a long wait for the neck I required so I fitted a temporary "B" quality neck which is now on my Blue Strat.
