Not sure where your located but looks like your shit could be my neighbor! In all honesty you could buy a stick of 2x5 or 2x4 and splice in the back half with some real steal! As long as the front half is worthy. And if you plan on a sas get 2 stick's and make a new frame ,arch it up a bit more in front . Use your original frame for measurements. I have been in your position before years ago and you will soon realize that you are throwing good money away. Looks like you don't have a lot of time in it yet.