DETAILED STEP BY STEP 1. I measured my bi-fold doors which were 11 3/4" width by 78 3/4" height each & I had 4 2. I picked up a utility panel @loweshomeimprovement which is just cheaper plywood? I paid $27 for 1 piece 3. PRO TIP! Have it cut at the store!! Bring your measurements w/ you! 4. I bought 10x of general purpose lattice pine. They were 8' each & I bought a few extra just in case. I only used 8 PRO TIP: make sure they are straight before buying! To be cost effective, buy PVC lattice trim ($6 a piece) 5. I used wood glue and placed the plywood panels on top & applied wood clamps 6. Trimmed the excess plywood w/ my @HARTtoolsUSA jig saw & sanded the edges smooth with my @surfprepsanding 3x4 electric ray 7. Measured & cut the lattice trim with my circular saw. I used scraps for the trim on top&bottom 8. Used wood glue on the back of the lattice trim & placed it where I wanted it on the doors & applied clamps 9. Used my @HARTtoolsUSA brad nailer to reinforce the trim & plywood to the doors. Make sure your nails aren’t too long! 10. Caulked the trim using the DAP Alex Flex White Molding & Trim sealant 11. Flipped over the doors & drilled holes for new hardware 12. Sanded with 220 grit & used a tack cloth to remove any dust 13. Painted using @SherwinWilliams Grizzle Gray. 14. Attempt to re-install the doors & cried LOL. This project was easy EXCEPT for the re-installation I didnt add any width or height to these doors but I did add THICKNESS. It increased from 3/4" to 1 1/4". I didn't anticipate the extra clearance the doors would need in order to open, oopsies So I had to move the track away from the frame & the doors had to move slightly away from its original position to correctly. Since they're closer together now, they were hitting each other & would't close. This honestly took me about 6 hrs to figure out & I was about to light the entire project on fire I took a crowbar to the extra molding on the frame, ripped it off& I was able to get the doors to function LTKFind LTKhome LTKunder50