Humidity is slowly heading north. It was at 62 all day yesterday and has finally crept up to 63%. I have two bowls of distilled water and a cigar oasis in there. I put the CO in to move air around a bit.
I picked up a used tower about a year and a half ago off craiglist - Power Tower or whatever that is pretty common. It's not as nice as the model you got and I paid $200 for it but it works and has a lot of room.
I seasoned it for at least 2 weeks, maybe closer to a month before I started filling it up. Really need to be sure the wood has absorbed enough moisture to stay stable. The air inside is the easy part to level out. You might want to pull the drawers out and set them on the shelves just so they get exposed too.
Nothing worse than battling the RH once you start filling it up.