A few thoughts on weld-on sliders:
1. Those sliders don't appear to include a frame plate. You generally want some kind of a large bearing surface to spread the load out across the side of the frame. The frame is only ~1/8" thick on these trucks so you can pretty easily bend it without the plate. You'll need to add (and cut) some 3/16-1/4" steel plate to get these sliders finished.
2. Actual welding of the slider is not that bad. I'd have no qualms knocking out a set of siders with a 110V MIG or even flux core welder if you don't mind a bit more cleanup. If you are going to tack them up you might as well finish them and hone your welding skills.
3. Weld-on sliders are just about permanent. Taking them of is not going to be easy without scarring your frame pretty bad. So if you mangle one on a rock....get T-boned....or just want to re-paint them....it's not going to be easy. I prefer bolt-on for all of these reasons, they are just as strong and it's possible to remove them when needed.
4. I got a pair of All-Pro siders for a 5th gen T4R and used them on my GX470 for $700 shipped last year from Summit Racing. They are $800 now. I really like them...and they are bolt-on and have massive 1/4" steel frame plates. By the time you buy a DIY kit, the 1/4" steel frame plates, and welding supplies (or pay to get it welded), you aren't THAT far off from a set of pre-built sliders that have things like a tree kicker, solid top plate, DOM external tubing, etc.
If you do want to go DIY this kit seems a lot more complete, probably won't require any cutting, and has pretty much everything that a prebuilt set of sliders has:
This is a DIY weld-together rock slider kit that is available in 65", 68" and 71" lengths. The 65" length fits the 1st-3rd gen 4Runner, 1st gen single cab Tacoma, FJ Cruiser, 1st-2nd gen Nissan Xterra and R50 Nissan Pathfinder. The 68" length fits the 4th-5th gen 4Runner, 80-series Land Cruiser...
www.coastaloffroad.com