Is this OK?

[Albert Clark]

We use versa tops for our fish aquariums. Have you tried using a heat lamp with versa tops? The OP's photos show heat lamps. I think versa tops limit the heat source to tape or pads.

So you used to keep pythons in tanks but now in ... racks? Could you elaborate as to why and the major differences?

Snake behavior?

I'd imagine cost could be an advantage for some DIY racks, but I've also seen BoaPhiles that are more expensive vs tanks.

Ease of cleaning?

Ease of maintaining heat/humidity?

I'm sure space is the biggest advantage. I'm impressed with this photo of 36 adult sized tubs: http://www.boaphileplastics.com/Rhin...ing_a_ball.jpg
those are 34" long tubs, almost as long as a 40gallon tank.

I'd imagine breeding is easier with use of a thermostat which means racks too.

. Versa tops would eliminate the need for heat lamp as they increase ambient temps in a terrarium setting. Unless you just want better visibility of the animal in the terrarium you could certainly use just a daylight or incandescent bulb.
As far as differences of tanks vs racks, tanks really are for fish as it's problematic maintaining both humidity and heat. Certainly as my collection grew and space became a issue it was apparent I had to go in a different direction. I invested in C serpents racks initially but Reptile basics racks are competitive and probably more affordable.
Ease of cleaning is straightforward.
Heat /humidity incomparable to tanks