depends on your torso proportions. I run the tasmanian tiger rig as well with the hsgi belt. The rig alone without the backpanel will sit lower on your chest and may interfere with anything on the belt that sticks up or out. I find with the optional backpanel you can set the rig a lot higher so it doesn't get in the way, at least on me.
The tas rig is a bit limited to anything rifle mag sized, but you can see how I have mine set up in the photo below. I tend not to put much in the side pockets so anything mounted on the sides can be accessed fairly well, I also crouch, crawl, sit, etc in this setup just fine. I do a lot of kneeling too.
That's me with the green shemagh and derpface. I'm about 5'8" and 235-240 in that photo, I've probably lost about 20-25 pounds since then, the rig is a bit looser now with the back panel but still sits pretty high. I'm working on a way to tighten it up.
I have another back panel in multicam sitting here, brand new I will probably be selling in the coming weeks.