Hello Michael,
Great buffed out 28. I buffed out a metal Eureka for the fun of it at the shop in the 70's and it looked impressive like your 28. I just bought a late Hoover 305 which I do not understand why no height adjustment and I know I never worked on one at the shop. I sort of only remember working on 27s and 28s. I am missing the bottom plate but it did not cost that much and could not pass it up.
Have fun and you sure have some good looking machines.
Thank you,
Pete