Don't worry, whichever technique I use will have many, many practice pieces made up and tested prior to chassis building
I'm just thinking that being taught MMA (arguably more tricky from my research) by a decent welder would produce better welds than self-learning MIG welding.
So far I've only found one builder who used MMA, which is surprising to me considering the price of the welder!
(one thread I remember reading somebody recommending a £700 welder - something that might be a little overkill!!)