Nice. One tip, if you got the time, go with a PVC cage. It will save you lots of headaches trying to mess with temps and humidity. Also no matter what you go with, you NEED a thermostat to regulate any heat source you use. Also avoid dial temp gauges as they are usually very inaccurate. Go with a digital one. Also offer the same kind of hides for cool and warm side so the snake doesn't have to choose between security vs warmth. And avoid lightbulbs for heat, they kill humidity. If you have to use some form of top heat, go with a CHE and make sure the snake cant get near it.
And when you feed, make sure the prey is no thicker than the thickest part of the snake and if the snake is over a year old and under 2 years old, go for once every 2 weeks on the feeding. Boas are easy to overfeed as they always want food.