This is the filter holder I put together for the 14-24 f2.8 lens. It has 3 filter slots for 4x6 filters. Lee makes an adapter ring that will fit in a slot for a 105mm CPL. I think a wide angle Lee hood will work in the last slot leaving room for 2 filters. The angle of view misses the last slot by at least 1/8” on a DX camera. The adapter slips on snug but can be turned if needed.

mmalkin15 sent me some pictures of his adapter and gave me permission to post them. He used a Lee 100mm push on filter holder to make his.