Ok, I'll bite, I think the veiwers are being kind to you. You need a plan before embarking into this world of mower racing, most have evolved into someting far bigger than we were in the past. Todays mowers are super fast, competive and as you know, speed cost money.
Here is what I would do if I were you. Find a racing club near as possible, hang out with them, study the fastest racers, listen to them talking, find the winners and try to duplicate them. Once yu get to their level, then you can advance to make your stuff faster, don't reinvent the wheel.
The welding technique you refer to is gas welding, yes it will make the metal red hot, is it the best way weld, no. Find a friend who knows how to weld and learn. Mig welders are cheap and what I call an idiot welder, anyone can learn quickly.
Attend as many races as you can, figure what your budget, expertise, and skill level will allow you to run.
Lastly, good luck, we need new people racing and there is a wealth of information on here, pick through it.
