Tannoy v12 drivers 3142 in folded horn design ?

Hello all

Im looking at building some folded horn style cabinets for a set of drivers that i have acquired, old tannoy v12 drivers which are 3142. Ive done alot of trawling the internet to see what I could come up with but I cannot find anything that will work exactly. I dont know about the complexities of speaker design so need some pointers on how to go about this. I understand the basics of the folded horn principle but need to figure of the dimensions that will work.

Any help greatly received!

thx
Grif