I recently completed a DIY build of a wireless site survey cart and I am pleased with the results. This journey led me to home improvement warehouses more times than I am required by law to admit — BUT I have done most of the R&D for you and you should make less trips than I did if you decide to build a similar cart for yourself.
My goal was to have a sturdy, lightweight cart that would break down to fit in my truck, but also be easily repairable in the field. Additional wants were the ability to hold my bag and Pelican case while transporting the cart around a site.
This design is not perfect — Actually, for my current needs, it is perfect. The cart will probably be refined as I put miles on it. I am also open to improvements that you may be able to suggest, so do not be shy. You can also visit this LESSONS LEARNED link to review my updates and comments.