I've made hoards of off-road bumpers in the last 4 or 5 years. In fact...that one you posted is one of my firsts, years ago and its still on my truck today (photo below taken last Saturday).
You can purchase the steel for around $100-$200. If you want to "stick-build" it, you can probably get it done in a couple days, and it will look stick-built. Figure $50/hour minimum and you're looking at $800 in labor. Throw another $150 on for powder-coat. Total should be around $1200, mid-west pricing (more for the west coast). There is nothing wrong with stick-building bumpers, and I still do this frequently. But I'm able to do it myself and eat the labor. If I had to pay a guy to stick-build bumpers...it would quickly skyrocket the price. Some bumpers are easy to stick build...like Jeep & full-size rigs. This is because they are fairly flat on the front & rear. Curved front ends like the H3 can get very complex, when you are limited to working with flat material.
If you want to design it on computer and form the pieces, it will cost slightly more but the fit & finish will be much better. There is much less distortion and man-hours because the welding is kept to a minimum. You will save a bunch of grinding and welding cost...but you have to add-back the computer time, and also the break-forming process. I use this latter method, and it allows me to produce them in quantity with near zero variation. It costs more up front but, it pays for itself with consistency over the long haul. This method also allows me to fine-tune the production process and save time & material here & there, without losing the repeat-ability of the build. It rarely pays for itself on one-off parts...the payback comes after many dozens of bumpers. I also use a custom welding fixture that mimics the H3 front frame rails. This allows the fab guy to hang the individual pieces on the fixture, tighten them down, then weld them up. This guarantees a perfect fit every time.
If I could make THORparts bumpers any cheaper...they would be.
