I made an LED strip base out of layered 1/4"MDF for my light up sign.
Here are the five layers.
First layer I mounted the LED strip.
layer 2 cut to accommodate the shape with the cord and connector.
Layer 4 less wide for the acrylic to sit on.
Layer 5 painted black and thin to slide and hold the 3mm acrylic.
LED lit up.
Acrylic cut to fit snugly in the base. Lower right corner shaped to accommodate the LED strip connector.
All put together.
Final look with LEDs on.