On Monday, March 27, 2017 at 10:55:55 PM UTC-5, wrote:
On Mon, 27 Mar 2017 19:30:28 -0700 (PDT), Tim
wrote:

Looks good. For myself I'd add an extra support through the frame (front to back) and would have moved the axle a leedle further aft for a tad bit more tongue weight. But otherwise. It's looking good!

This is just something I am pulling around with the lawn mower so I am
not really too worried about tongue weight. I doubt it will start
swaying at 5 MPH. I may still end up moving the axle back a little
since I want to raise it up a bit for better ground clearance. I have
some 4x4 Azek I am thinking about putting in as a spacer.
Once I drop a piece of 3/4" plywood in there it will be plenty stiff
enough for anything I am likely to be hauling around.
I really do not want to make this thing too heavy because I plan to
hang it on the garage wall when I am not using it. I need to be able
to peing made out of bed rails I kneswick it up. Right now I doubt it is more than 30-40 pounds.

Being made out of bed rails i knew it wasn't meant to be heavy hauler, but you might load it up much more than you intend.

BTW, there's nothing wrong with an old stick welder. My AC lincoln "buzz box" has served me well. DC is better but this does the job for me just fine.