as for your comment about the tinfoil on the inside of the cab...
even with dull side out, you're going to create hotspots. with just 2 CFLs going it may be okay. but i'd either:
A) find some way to exhaust the hot air
or
B) remove the tinfoil entirely

personally, i'd do both A & B, then on a nice sunny day, spray paint the interior flat white. glossy white will absorb light. metal, btw, is not automatically reflective.

it looks like you've got some light leaks still. perhaps 2 layers of black duct tape over the spots in question before you spray paint?

just my opinion. good luck.