Add the Access Panel
Measure the width of the hot tub's access panel (Image 1). This will be the width of the access panel door. Cut several 2x4 beams to the width of the access panel. Lay the beams next to each other and make sure they are flush along the edges. Then, screw two 2x4s across the beams to keep them together. Once the access panel door is screwed together, set it in place in front of the hot tub access panel (Image 2).