> You never save money building it yourself
I know where you're coming from with this. I've been refurbing my house myself and I doubt I've saved that much because the "saving" has meant that I've been able to buy tools and, of course, better quality materials (e.g., more expensive flooring). I've also often chosen to go the extra mile with improvements where I might have scaled back if I were paying someone. I suppose you could argue this is a saving in that I've got more value out of the money I've spent by treating my own time as "free labour", but have I spent less? I doubt it.
Still, I don't know if it's entirely true in all circumstances. Here, for example, TheGeekPub (The 8-Bit Guy's brother) manages to save himself a ton by building his own electronics station rather than buying one or paying a carpenter to do it for him:
https://www.youtube.com/watch?v=_KfWMJV7fQ0
But then, as becomes evident when you watch the video, he already owned all the tools he needed and just had to buy the materials, which were relatively inexpensive.
I think the results look great though, and it's clearly an extremely functional piece of furniture.
Like a lot of things in life, does it save you money? It really depends on your starting conditions (skill level, tools and facilities), and how much you want to invest in the project (both time and money).