Getting slightly crowded at the studio (exhibition 17 Aug- 3. Sept. at Blomqvist), this is the usual setup. I try to keep the plaster work contained on the tarpaulin, makes cleanup easier, use two pairs of shoes in an attempt to keep the mess at bay.
Ideally one should have two separate rooms, (one for plaster and one for clay) - also changing shoes between rooms is a good idea. Saves time in the long run.