Love the chairs. Assembly instructions could have been better, BIG SURPRISE!!!!.

My version......
Assemble screws by size (3) sizes ....large medium and small 
Step 1, parts CDE go into chair legs. (smallest screws)
Step 2, pull up Velcro cover under seat to expose screw holes, use ADA parts (largest screws)
Step 3, parts BDE go into center hole of seat , there are 2 of these.
Once I figured this out, the second one was so easy.