Station 1 is what the engine mount will be bolted to and needs to be perfectly square. Measuring 13-1/2" x 11-1/2" and made from 5/8" x .035" tubing, I cut each corner with the hand held cut-off grinder and then numbered each join as minor differences between joins would upset the 4 individual 90 degree angles. Held firmly on the steel plate with clamps before tack welded and then turned over to tack the other side.