How to build a standing desk for an elliptical trainer

I already posted elsewhere my design for the make-your-own computer stand I mounted on our treadmill. That design would not fit on our elliptical trainer so here's my DIY solution.

Measure the bars the Y-shaped arms will have to fit over and draw the radius (plus a little extra room) on plywood; figure out the correct angle for the arms and cut them; use a jigsaw to cut out the arms; mount them on a flat piece of plywood that the computer will stand on; add a horizontal bar in the back so the construction won't slip.