I dont think there are any missing posts in this thread, but I definately remember reading about the sand and oil and such in the other thread. hmmmmm.
Anyway,
I cant use sand and oil in this one because it is made from MDF, and I think it might have a problem with the oil
I have access to the rubber stuff and it is as dense as, well, tires which should damp out the vibes some.
I never thought of putting it in the pipes, and that is a good idea,I will do that too although I think concrete would be a better choice for the pipes.
The box is designed to accept 1" gas pipe which means the cutouts are actually a bit bigger than 1". I considered drill rod, but went with the pipe because a)I already have it, and b) shipping stuff here from the US takes a long time in customs (my last order was 14 days) and I get completely screwed in customs charges to the tune of almost 50% of the value of the order.
So Gas pipe it is.
The torsion box is nearly done, but I have to make 100% sure it is flat and true when I close it up. Any warp will stay when I attach the other side.
I really love the idea though, lighter and stronger is a winning combination.
co