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Some suggestions:
I for your base plate that attaches to the ground, work out where you want your holes to be - then drill through a wood back plate - so you have a light wooden plate you can use when setting bolts into your slab.
When you make your pier use per-galavinised steel. Go for the largest diameter pier you think functional to add stability.
Add gussets - a bit bigger than you think you need it to stabilise the pier.
When you well the pier column to the base - the heat may warp the base - so consider maybe spot welding in a few places, rather than say starting at one point in the column and working your way around the circular base of the column.
For the hear of the column you can either use a flat plate wielded on and then another plate bolted with four large plates on top of this - so you can level it - or make an aluminum cylinder that just fits into the top of your pier and bolt a slightly over-sized stainless steel slim disc on top of this; then you machine in the well where the base of the mount fits, then slide this into the top of your pier and bolt it in. I did the later approach - looks really good, no sway or movement whatsoever, your can't fine tune your mount level - but it doesn't need to be perfect. Once you drift align well it doesn't matter how exactly level your mount is.
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