@shammer_2ks
Sir
With all due respect, no one will come to you for making the enclosure.
Get it done with a professional enclosure maker from a good and reputable Audio Shop.
Kicker L5 are not meant for sealed enclosure, you need a vented enclosure.
3.25 ft3 (92L) + port displacement
3 x 13.25” (7.6x34cm) port, 14.5” (37cm) long
3.25 cubic foot of external volume, good quality MDF, it is Medium Density fiber of 5/8", if you are powering around 300W RMS 3/4" or 1.9 CM inch thick, if you have an input power of 500W RMS or more.
Seal all corners airtight with silicone and add some polyfill,Ported designs will require covering the end of the port (located inside the box) with grill cloth.
poly-fil will decrease some output, but improve deep bass.
Their are many calculators for ported enclosure on Pakwheels, try this one
Speaker Enclosure Volume Calculator
If you think, you can not manage that, get a sealed enclosure of .88 cubic foot, 1 cubic foot = 1728 cubic inches.
Just try not to make the enclosure rectangle, or any side of enclosure multiple of other side.
The enclosure should be strong enough.
Regards