Received the plans and thank you. I will be using some laminated wood for the baffle that I already have. This is a sheet of 19mm mdf laminated to a sheet of 19mm marineply which comes out at 1.496". What size hole will I need for the port with, lets call it 1.5" thick once rear panel is painted and what is approximate crossover frequency. I will build the box deeper than shown to allow space for triangulating the rear section which I then fill with sand. Done this before and it produces a HEAVY but very dead non-resonant box. I will submit photographs if someone can explain how to. Also I need to buy 2 X Vifa DX25 tweeters from you. Perhaps it is better to discuss the deal by email. Regards Charlie