I'd also recommend finding a welder. It shouldn't cost you much and you'll have a nice sturdy stand you can depend on.
I'm a fan of the single-tier stands. My first stand was a 3-tier brew tree, but I got tired of how high everything was. Even with a 2-tier, if you don't put the first tier really low you'll need a step ladder to stir the mash (if that's where you put it). I do understand the why people like to gravity drain the MLT, but if you're careful slowly pumping the wort from your MLT -> BK doesn't cause any problems.
Also, a single tier should be the easiest/cheapest to build. Basically, you just ask your welder to put together a steel box of the dimensions you want. I used 2x2" scrap steel that I got for free, but it's way overkill. I think 1x1" is probably fine if you support the middle, and lots of people have used bed rails/angle iron successfully. You should be able to plumb and mount your burners if you've got any kind of DIY in you.
Here's a pic of my two stands side-by-side. The BK on the 3-tier is really low, and you still have to use a step stool to stir the mash. No problem with the single tier, though.