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Hi Clive
There are two ways of looking at a project like that.
1. As an execise in your mechanical ingenuity to design and build a drive mechanism to do a job that is much easier done in other ways.
2. As a way to turn an old design equatorial mount into a mount for photography
If the aim is way 1. you could start up by reading up on the Bartel's system. I built a friction and toothed belt drive for a Dobsonian mount using the drive motors and controller for a Tech 2000 system about 20 years ago but it was not stable or smooth enough for photography.
However if the aim is to do astro photography you will probably need to spend enough money to have purchased a PME mount by the time you get to mounting that telescope on it.
The Sampson mount in its day was great for astronomy work but no where near as good as the simpler modern off the shelf equipment such as an EQ6 which is about the minimum required to support a short tube 8" Newtonian.
Barry
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