I am thinking you will need two molds and a sizer. One mold is the Lee 125 RF for fun and frolic and the other is the Lyman Keith style 170 gr. for business. The sizer might be a 359 Lee. You also might consider that little lead melter that is for hand pouring fishing jigs and only holds about 3#. That little pot is available from fishing lure component supplier, Barlow's in Richardson, Texas. That pot and a 15"x15" piece of plywood to set it on might work quite nicely on your balcony if it has a small table. You could put the whole thing except the plywood in a shoebox for storage.