I made 4 of those myself recently for a shooting platform and 30 degrees is too much of an angle on ours @ 4 feet off the ground. I have a total of about 20 minutes time in each one and get the material for my personal "government" projects free,since I work for a steel supplier.
"I come in peace. I didn't bring artillery. But I'm pleading with you with tears in my eyes. If you $!&@ with me. I'll kill you all!"
Marine General James Mattis to Iraqi tribal leaders.