alleyyooper,
I have basically the same portable bench as what you made up, except mine is for right hand shooters only. I use a 5 gal. bucket w/rotating cushioned seat to sit on. It works great!
YourT/C High Plains Sporter looks sweet, but I don't know about the T/Cquick release scope base. I had one years ago and got rid of it. It had too much play in it. I hope yours is better than the one I had.
What's your favorite load in the HP Sporter?