Tom, Andrew.....
They say that imitation is the highest form of flattery. Well, you both have inspired me to add an aluminum T-track table to my new Buddy Alpha BT48-12, very similar to both of yours. I am taking a slightly different path, since I also want to mount my 6" indexer parallel to the Y axis, and I want to be able to move the table between the standard powerstick and the 4 ft one (6 ft long) as I need it. I don't have room in my shop to keep the 4' powerstick on all the time, and most of my work will fit OK on the 2' x 4' standard space.
I also went with 8020 aluminum, but used 3075 extrusion (3/4" x 3", with 5/16" slots on 1.5" centers). I am fastening each of them to a piece of 1/4" aluminum 6" wide x 48" long, to in turn fasten to the powerstick under the extrusions. I used my ShopBot to create an MDF jig to square the extrusions with the aluminum plate. Since the tool created the 90, I know it will be dead on parallel to the Y axis when I mount it parallel to the powerstick. I bought the 8020 from the Amazon store, at a total of $596 for 16 pcs, 60 in long. I also got 1.5 x 2 x 0.25 x 4 ft aluminum angle for each edge. I bought 2 sets of 1450mm long 16mm mounted bearing rods including 2 sets of SBR16UU bearing blocks for a total of $200, from the Ten-High Amazon store.
I'm still putting it together. Lots of drilling and tapping. When I get a minute I'll snap some pics and post them.
One note: When complete my table will weigh a bit north of 125 lbs. I checked with SB tech support and they said they've tested Buddy's with 500 lbs on the power stick with no missed steps (on an alpha), so I should be good.
I just wanted to take a minute and thank Andrew and Tom and all that post on this great forum for my their inspiration and help with things like this.
Tom
Buddy Alpha 48-12
HSD 2.2hp
6" indexer