On small cruising boats (less than 45ft) the interior space is a priority and most only uses the sails that are rigged so a dedicated sail locker is just a waste of space.
As has have been said makes more sense in racers that are always changing the front sail. One of the modern few small sized cruisers (41ft) that has a good sail locker on the front of the boat with outside access is the Comet 41. The sail locker has space for a big geenaker and a storm sail with some space to spare.
Charter the competitive Comet 41through Solent Yacht Brokers of Cowes