Looking to fill in the blanks

So i have decided to build a nice display enclosure for my BP's. The carpentry part was easily solved through a friend and i have a few questions on heating. I was planning to use Radiant Heat panels to control my temps. My question is since the panels are mounted in the top of the enclosure do i need to put heat tape of some type under the lineing i plan to use as a hot spot or will the heat panels put off enough IR heat to make a hot spot plus help with the ambient temp. Or am i completely off base in my thinking. I planed to build the enclosure from wood and line it with xpvc, so putting heat hunder it wouldnt be to difficult but i want to know if its overkill or much needed from others experiences. Thank you.

That really depends on how tall the cage is. If it is 24" or below then the heat panel should be enough alone as long as the room the cage will be in doesn't get too cold (under 65)

My tank is about 2ft high and I have an RHP and flexwatt. Took a bit of screwing around with my thermostat but I'm now with perfect temps :)