Adrian, many people just have a cement pier with steel reenforcement inside it, with three threaded rods sticking out the top. I have also head of people using Plywood (although rather thick) for the pier head too, it's only limited by your imagination, and your ability to use what you have.
Yes I am lucky that I can get access to all this stuff, others are not quite so fortunate, but with a bit of mind power anything is possible. Throw a few ideas out and see what you come up with. Remember this forum is here to help too, so others may be able to give you some guidance on the design.
Give it a go, you wont be dissapointed.
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