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Thank you Mike :-)
It really works well. I guess very few upgrade their old drill-driven Tormeks.

I think it's relatively expensive (200USD) to upgrade to an original AC engine.

Let's see, maybe I make a custom grinder at a later stage.

I have an old ST-250 from the late 1970's.  The original Gotland sand stone is weared down to 20 cm, and I have done some upgrades:

New cylinders for an universal stand. New universal stand US-430, MSK-250 axle with Easy Lock. Grinding stone SG-250.
I realized that the frame was about 3 cm more narrow than the T-8, but it works.
I use an old geared Bosch drill, with a customized bit for the drive wheel, it's very strong.
I kept the original bronze bushings, and it fits the new axle perfectly.
The new stone doesn't wear off so much as the old sand stone, and I use a very strong magnet from a Tandberg loudspeaker to collect the metal in the cooling water.
The original tray is not working so well no, so I must move the supports a bit outside the metal frame.
I have invested in 3 jigs, knife, long knife and for axes.  I also got the truing tool and a stone to change the grit on the stone. Works very good.
I made my own leather honing wheel I mounted on a quick grinder. I use the Tormek PA-70 pasta. and it works fine.

The upgrade has been a bit costly, but still far away from T8 in total price. The only thing is that the engine I use is a bit noisy. Maybe I upgrade with a silent AC engine.
It's fun to upgrade the good old ST-250! 

First day with the new stone, I sharpened 13 knives, all my work knives from Mora, Clas Ohlson and Biltema and a chef knife from Vargen & Thor :-)  They are now razor sharp.

Hi Tormek fans!
I have decided to mount the XB-100 bracket on a L-bracket. There are plenty of space under the top of the frame.
If I use a drill with reverse, I can use the same position for grinding against (Forward) and with the stone(Reverese) from the vertical mounting.
I guess I just use up the old stone on this setting instead of investing in new stone and new axel, because I quickly will reach the cost of a new T-4.
So next is a long stay and jigs!

Keep you posted!

Thanks a lot for the advice! 
I will check with support if I can add the bracket directly on the side, it would be more elegant.  I should make shure that the ijg arms wont be too short for reaching proper angles.  There are plenty of room inside the frame for drilling holes.

I have plans to upgrade my old drill-driven ST-250 with the upgrade BGM-100. I plan to mount it vertical on the frame, by using a L-bracket. Anyone with experience in this way of upgrading?(See pic Tormek ST-250-2)
I also want to change the old Gotland sand stone that is the original from 1974.  Is it possible to use the new axle MSK-250 for upgrading ST-250?