Many old school zoos are notorious for their terrible care of their animals. Some have even lost their acreditation because of similar care. An Aladabra should NOT be on concrete.
I would think a thick layer of hay would help cushion the tortoise but might make clean up more difficult.
How many months of the year will the large sulcata be outside? It REALLY needs to be outside most of the year.
Using lights are a poor runnerup to year round natural sunlight. However if you must use lights you need to do your homework. Not all ***reptile lights*** are created equal. Some do not produce enough UVB to help your big guy - others may actually produce a dangerous spectrum that could hurt your tort or you. You will need a series of lamps for such a large tortoise. Don't be surprised if your electric bill jumps at least a hundred dollars a month when you use the proper amount.
Most people in the cooler areas find smaller tortoises more appropriate. Sulcattas are more appropriate for the warmer areas such as California, Arizona & Texas.
Good luck.
Good source for proper lighing info