The first version of my kitchen set up was in 1982 when a friend of mine used it on a camping trip.  I liked it and over the years thought of how it could be improved.  As I said previously there were several versions of the setup.

I looked into using telescoping aluminum poles, but it was quite expensive and heavier than the wood version.  The PVC pipes might work, but unless you get a tight fit between the pipes it will sag.

If you use my 2 x 2 version, the holes must be larger than the bolts because if it rains the wood will swell and the bolts won't come out.  The 2 x 2 should be on top of each other and not side by side to maximize strength.