too large for slabbing

Since the start of the signature sets here at Collectors Society my ship-themed coin collecting has gone overboard. I collected coins with ships before the signature sets started but I kept most of them raw and was planning on building some sort of presentation case for them..now I get them slabbed to include in my High Seas Signature Set. Sometimes the cost of slabbing is greater than the value of the coin, but I want it as part of my collection because of its uniqueness or overall beauty/eye appeal.Recently I have even started buying silver bullion bars with ships on them and oversized coins-2-5 ounces-that fit my collection..I hope that someday NGC will make a way that I can include these jumbo coins in my set. If they can make a large holder that can hold 5 coins at a time {multi-coin holder} maybe someday I will be able to add some of my other coins to the set that are too large..or maybe I should just pull out those old plans for that presentation case...

MVC-915S.J