has any one done this ....

hi all , i havnt done tufa yet and im so ready to do a few pieces . the thing is its winter . ive read all i can find on the subject and like with everything there are contradicting ideas . so i was thinking about mixing outside working in the garage and curing in the house . its in the 40s and 50s by day here still . basically i was wondering if those temps are ok to work in . i know they have to cure at room temp or more . i want to make planters ( i read about leaching too ) thats why im so anxious to do some i want them to be ready by spring . thanks