The B7100 I worked with I thought had Kubota decks on them, however I am very aware that they could have been made by someone else, I know of a manufacturer making implements and trailers , some are painted orange and badged Kubota!
We were using them for local authority grass maintenance, verges, play areas and some amenity areas.
The electric front PTO was a little troublesome, and the crankshaft connection could fail, damaging the front of the crank.
Bearing in mind these were working five days a week for about seven hours a day, maybe they did quite well, the operators were bonus driven and not sympathetic to the kit.
To fit the deck you just drove over it and connected all the linkages and drives.