Thanks guys for your help. I managed to fit 10 bikes on one 2X4 in the back shed. I'm going to build another rack today that will fit another 10 bikes but with some extra room for some wheelsets. Hopefully my design works out. Pics upon completion.
__________________
Ese dicho que me han dicho que tú has dicho que yo he dicho, ese dicho no lo he dicho, porque si lo hubiera dicho, ese dicho estaría bien dicho por haberlo dicho yo.