you could probably throw a CFL down below and use that space as a cloning area.

and don't bother with reflective material, just paint the inside flat white, that'll give you about 90% reflectivity.
mylar would give you about 95% if you get it completely flat against your walls and keep it really clean, flat white paint is way easier to use and to clean and, it's way cheaper.

good luck with your grow, i look forward to watching your progress