I understand your liability issue, but just because they are a licensed contractor with liability insurance doesn't mean they will build you a quality runway. Would a contractor even understand how to brace the plant box? If they use nails, which most probably would, kiss that runway good by pretty quick, especially if you have to move it. I went nuts on building a great portable, near indestructible, raised wooden runway 1 1/2 years ago myself. I finally started making the plans for building it, but I do have some great pics of my build process I've been giving coaches across the country. I even had 2 sections of my runway fall 6' inside a truck on their sides and you wouldn't even know it. It was an accident of course. I built it to last and went crazy painting it and stenciling every 6". The white line defining the runway width is "loop" velcro strip. I made flat plastic runway markers with "hook" velcro for vaulters to use. How many times have you ever had a marker get "kicked" or moved and didn't realize it until your last minute bail out? no more "kicked" markers with what I did. Anyway, here's some pics of my runway. We setup the 104' runway and tore it down every practice for 1 1/2 years. It's now installed permanently in-ground at my house where I had to move my club. Sections are heavy, but sturdy. Let me know if you want more detailed pics of how I built the runway. I have a large library of pics from the build process.
http://www.mansfieldathletics.com/pole_ ... unway.htmlA few more pics of the design are on our club facebook page here:
https://www.facebook.com/media/set/?set ... 8adb1123e8