Dynacord LSW

Hello people. i want to decide what pair of subwoofers i should build (teknival and edm ussage). I saw a plan from dynacord and seems preety simple to make. My question is: Did somebody hear or saw a builded one? I couldn't find anything on internet exept the plan. Or, how this planar will sound in comparation with a th18, bph or a scoop (my other choices for the build) The drivers will be 18tbx100 or void v18
I have a small dual 15 planar box but i can't hear a big difference than a br box, maybe a lil bit in directivity. Goal is @40 hz flat; or less.

I'm really into this project for the simplicity and the size of it (i can easely put a fullrange on top and will be at head level)
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