Welding wise, I use a Miller Maxstar 150. Its 120 volt DC only, since most of what I do is in the 30 to 50 AMP range its just fine. With the low amperage I'm used to, you can do a quick tack about a 1/2" from where you're holding the metal
Most of my tungsten is 1/16", I cut the 7" tungsten in half using the medium wheel on my bench grinder, grind a point on each end then do a fine polish on the 1/42" belt sander, I uasuly prep 2 or 3 tungstens at a time that way when I dip the tungsten or touch it with filler wire I have a new one handy. You will contiminate your tungstens.
The other tool that I must have is a 25" 18ga. max bench shear, I'v used Beverly shears, tin snips and aircraft shears all my life, but nothing can cut a crisp straight edge like a shear.
If you have two pieces of sheetmetal with a clean metal to metal edge you can do a series of small tacks and the joint will dissapear, no need for a full length weld.
I drill very few holes, most of the holes I need are done with a Whitney Junior punch. The holes in the RR AC turret are a series of punched holes and a file is used to connect them. The strip of metal in the photo with all the holes is a template for rims, I clamp it to another strip and punch the spoke holes, I'll do a photo of the wire wheel building process in a day or so.
We'll continue this in a day or so.
Jim