Spent a bit of time thinking about these areas, I may be mixed up about American Army Hospitals etc, but I do recollect that a local group called 'The Pollok Kist' obtained a lot of old photos, many of which showed the POW camps at Boydstone Road, and the one at the approaches to the Dams, (Barrhead Waterworks).
Remember that what I can remember of these areas was as a wee boy, out with his pals for adventures and bird nesting etc.
Crossing over the burn at Burnbrae School from Priesthill, and crossing over the fields, we would arrive at the old cottages that are still located at the bend just above the old POW camp foundations.
Standing at that junction (remember it was an actual road), looking down towards Barrhead Road...to my left was the old POW camp which although partially demolished, was still fenced-off and you could see where the buildings were.
Further left was the end buildings of Cowglen Hospital, which I assume would be the US Hospital described. and travelling down that tarmac road towards what is now Silverburn, there was another fenced-off area and withing that you could easily see a tall water tower.
Continuing always left you came to the ambulance repair and garage yards, heading up from there, towards the Barrhead Road, you entered the housing scheme to the left of the fenced area, or continued down to the Barrhead Road and to the Bundy clock, and a small housing development of about 20 houses which were built by the British Army.
Before the NSB at Cowglen, the memory is a bit vague, but travelling along the Barrhead Road towards the Boydstone Road, I do remember some building that sat almost on the corner, and as we would head up the Boydstone Road towards the cottage, there was a farmhouse to the right, which I think became a masonic lodge in the 60's.
Heading up Boydstone Road, to the left.....fields, and to the right the entrances to Cowglen Hospital, with derelict areas previously POW, and army properties appearing as you approach the cottage.
There was a popular 'lover's lane which allowed cars to park hidden to the right of the cottage, and along the tarmac road previously described here.
Some years later when working in Carnwadric, I could still head into the old Pollok Centre from the rear, by using that same route, and I vividly remember the flyover which straddled the old tarmac road, and the tunnel which started and ended under the motorway.
This became the 'lover's lane' as you could drive past the Ambulance yard and actually into the tunnel below the motorway, as it was lit 24 hours a day and remained open for several years.
This was prior to the South Pollok Football pitches being removed, and began the period when the 'Shows' parked next to the old ambulance yard, annually for many years.
Sorry it is a bit sketchy, but it may indicate where the actual POW camp physically was....!