Once everything was where I wanted it, I set the entire assembly up on a makeshift welding table I set up in the shop. When doing any finish welding, I find it easier to position the work where I can make a flat weld at a comfortable level. Kneeling on a floor trying to make a weld work on a vertical surface is no way to get strong welds.
Welding thick metal is going to be a challenge with any "hobby" level welder, mine included. Though it says that it will weld 1/4" metal, it won't do it for long without overheating, so plan your welds accordingly and don't just keep going--make sure you pause occassionally to let the welder cool off. I typically put my tack welds in the middle of joints, then finish weld on each side to minimize the time I spend with the welder going full tilt.
With such heavy metal, it isn't so critical to prevent heat build-up as it is with sheet metal, but if you are doing finish welds on one side of a piece with only a tack on the other, it is possible to pull the tack apart with the heat. Use caution and common sense.
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