I used to play on glasstop Dynamo tables in the late '70's...we had one at the student union on the campus of the college i went to, and a friend of mine bought one. We used to have tournaments at his house on the weekends. His glasstop was unique in that all of the ones we played on in bars or the one at the student union had black formica sides and top edge finishing. My friend's table had mirrored plexi sides, and black formica top edge finishing. I had never seen another one like it. Flash forward about 28 years, and my friend who still had the table tells me his wife wants him to get rid of it and do I want it! Remembering that table, how fast the play was on it, how pristine it looked, naturally I said yes. So I go to his house to get it and it is totally trashed. Cracks in the mirrored plexi, coffee had been spilled on the table and seeped through to the playing field, which by the way was paper, not plastic (this makes me think the plastic field you referenced is either a replacement or came later...the paper one has a big Dynamo logo on it). Anyway, the bar were still straight and the glass was perfect (this glass is called industrex glass by the way, if you are looking to get the right textured glass) but some men had been replaced. I have completely restored it...new mirrored plexi sides, new old style men (I can't find the chisel toe guys that were originally there, although someone is selling a set now on ebay, but I cant sink anymore money into this table now, so the men are old style, but a little different...rounder feet), new inner and outer bearings, I restored the paper playing surface, repainting the logo and using art markers that matched the green areas where it needed it.
So, to answer your questions as best that I can, I couldn't tell you the exact year, but there is writing on the inside from the factory that may give you an idea. Look and see if it has a serial number which may give a clue to the date. Mine HAD a sticker on the playing field that had a serial number, but I stupidly peeled it off before realizing it was put there from the factory.
You can buy new replacement old style men, but they are not exactly like the originals., but close enough. Right now on ebay you can get a set of the blue men, but the guy is asking $79 for the set...says they are new but in the picture they look used. They come up on ebay every so often, but I haven't seen brand new ones. Usually there are only one or two, not a whole set. If you do want the new replacements, check out Muellers at http://www.poolndarts.com/products
Thats where I bought all the bearings and replacement men.
I am not sure what openings you are referring to to get to the leg bolts. There used to be ashtrays on top behind the wooden score beads. They were square and had two screws that held them in place. The screws mounted in a diagonal fashion. I never saw drink holders on any of the glasstops I used to play on...all had ashtrays.
If you want to send me a photo of the openings you are referring to, I may be able to shed some light. Hit me up if you want to...firstname.lastname@example.org