It was just how the guy who ordered it wanted. I looked at a lot of other filipino style blades and they had bolsters like that as well. Only thing I changed from the traditional construction was he wanted the steel skull crusher pommel. Normally they would have been 3/4 tang with a pin through it.
Big hurdle is the tools. If you have access to a shop or the means to put one together, with the internet all the info you could need to learn is available out there somewhere. You can make a decent blade with a surprisingly small amount of tools,even without power tools if you dont mind the labor.