AndyBees, no problem. I buy tools and I make them. When I can't / don't want to afford them I try making them. Some people have made and sell nice tools for TDIs and other cars, and if that is the best path for one to take, go for it. If the cost is a big concern, spend a little time and make a tool which will work for you.
Making tools got easier with HFT, because there have cheap tools and parts which can be hacked into something usable.
If you're going to make a living (or side living) doing TBs and the like, then consider the already available tools, as they have likely been through a generation or two of enhancements.
One thing I thought of recently was cookbooking solutions for common TDI maintenance issues. For example, when setting the timing with VDCS, I find a 13mm deep, a universal and a short (1.5" extension) coupled to a 3/8" fine tooth ratchet gets to all three bolts consistently, and with good control.
For the valve cover, I use a 5mm 1" bit in a spring mount for 1/4" drive, a 1/4" universal, and a 6" extension to a ratchet works for the fasteners in the back near the EGR on my ALH's. Elsewhere a 5mm bit on a 3/8" drive with a 6" extension covers it.
For the 16mm motor mount, I need a flex head ratchet, a 1.5" long 3/8" extension and a standard depth 16mm socket. Except for the rear "hidden" bolt, I use a deep 16mm socket.
Tips like this in the howto have always been helpful to me, and while they might vary with different toolsets and models of cars, they form a starting point for someone trying to get through a job.
One thing for sure, the best tool on the TB is the writeup hosted on this site, with all the pictures. It makes doing the job easy, and has been a big help to me and many others. Even if you are not planning on doing the job, it gives one a good idea as to what is involved, and let's them see parts of their engine they might not otherwise see.