I am using a pro heat panel in my 36" X 18" X 18" Exo terra enclosure with the screen top that is divided into 4 with plastic ribs? Even before the RHP I struggled with humidity more than heat (plus IMHO) RHPs are more efficiant. I think you get a lot more heat spread over a larger area for the same watts of heat using any other method. I have all the screen blocked off with thin plastic and then covered with that foil bubble wrap. The sides are also covered with the same foil/bubble wrap insulation. Part of my issue is how I had to mount it with that divided screen top. It hung down enough my snake just had to try and get beside or above it. I blocked all that off and everything has been working great for the 6 months it has been set up this way.
No matter how much I sprayed and I use Cypres mulch I couldn't keep humodity high enough. I would stir a good amount of water into the mulch and I would get 65-70 percent for a day at most. It would stay higher than the rooms humidity but not high enough. It would maintain 45-50% and it would probably work but I wanted to do better. I have this snake in captivity and I want him to be as comfortable and thriving as possible. I finally went with a misting system and it is 90% hands off but for spot cleaning.
I think in that wood enclosure (and I think it looks good!) would work perfectly with a RHP. Contact Bob at Pro-heat and tell him about your snake, enclosure, and the conditions where the enclosure will be kept. He will recomend a panel of a certain wattage. Use that wattage to shop around and read reviews.