I have noticed that your website does come up blank, but trying it a couple of times it does load up. Perhaps I could arrange some free hosting for you with a friend if you would like. Contact me privately if you are interested (muhy3@iprimus.com.au).
The interior height of the box I have worked out will be 440mm high, the diameter of the port is 90mm, it shouldn't be a problem to just have it run down the side and then curving back upwards just above the driver.
This is my first DIY, and I don't know what to expect. I still have to buy the amplifier, and construct the enclosure, and my measurements seem all but right although mathematically they seem correct.