150? thats one hell of a budget.
id take that case, and borrow a dremel from someone.
google a nice stencil you'd think would look nice and slap it on the case and dremel her out.
go to homedepot and get a nice 1/8" thick plexiglass 10x8 and hot glue that baby in.
order LEDs by sets of 5 so its 2.xx a set and get some resistors from llamma. wire them up and hold them in place with hotglue, order 0603leds and change ur your ROL and run to paint section in the depot and get some good quality cans of spray paint. 2xcolor Krylons, and 1 can on clear coat.
$50 max, and invest that $100 remaining into a used psp to be the next victim lol