For your melamine/wood cage you should probably grab a radiant heat panel to go on the inside top of the cage. That is probably your best bet.
I've heard of some people using ceramic heaters from the top which would be a little less inexpensive.
Either way you will want to get a thermostat. The post from MontanaHerper said he thought you can use a RHP without a controller but this is incorrect to my knowledge. I just got 2 RHP panels from ReptileBasics for my PVC cages from AP. I had flexwatt run underneath the cage but no matter how high I set the controller I didn't achieve the heat temps I wanted so I had to spring out. The RHP's put a lot more heat more efficiently IMO..
The ceramic heaters might be cheaper but I'm not sure they'll last long enough...
I spent I think $80 on 1 80 watt RHP which is good enough for the 6 foot cages I have. If I were to go with an 8 foot cage which I'll need eventually you might need a 100-120 watt RHP which will probably run just north of $100 a $80 controller..
Heating is a bigger expense than one might think, but it is essential..
Let us know what you chose since other people probably have the same question...
Also -- would you mind posting some pics of your cage if you can. I like seeing what others can do with wood/melamine.. I'm currently debating whether to buy a boamaster 8 foot cage or make my own.. $390 from boamaster seems like not too bad of a price for such a large cage..
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1.0 Het Albino Burm
0.1 Albino Burm
1.1 Mojave Ball Pythons
0.1 Normal Ball Python
1.0 Albino Ball Python
1.1 Pastel Ball Pythons
0.1 Spider Ball Python
0.2 Het Albino Ball Pythons
0.1 Lavender Albino Retic
Seeking bigger cages for the family 