Accu-Fast cushions were introduced in the early 1990's so your table is newer than that. My Olhausen was bought in 1993 and it has the date marked on the slate so you should look underneath the table to see if you can see any date notation.
It's hardwood rails & skirts - looks like maybe cherry. Possibly the legs may be laminate, but would be hardwood veneered outer ply.
Slate liner would be engineered product unless hardwood was ordered - then would likely be poplar.