Here is the solution :
With the pingpong bicycle (for the brittish : wifwafcycle ) you finally can go anywhere and take your ping pong table with you.
Hours of fun ping ponging in the middle of fields, on pavements, on squares in the city, even on the road (this is not adviced)
are guaranteed with this easy to make yet proffessional grade ping pong bicycle.
Step 1: Find old bicycles and metal tubing
Finding old bicycles can be hard in some parts of the world, there is a good instructable on buying used bicycles if you click here, but i advice to look for free ones (i'm just cheap)
Then you need some metal tubing. if you're lucky you can find tubing like i did (already tube welded on 90 degrees).
Step 2: Put it all together into a frame
There is a nice instructable on building a cargo bike if you click here, for this you can follow untill step 7.
If you're really going for a zero budget bike (except for some welding elektrodes an elektricity) you can in stead of buying ball joints make your own steering rod couplings like I did :
I took a bolt and welded it to the front fork.
On a tube that fitted around the bolt I welded another bolt.
On the steering red I welded another tube that fitted around the bolt.
Check out the pictures if this isn't clear.