Box design

I'm needing help building a box for a sundown sa 8v 1.5 (after my sa 8v2 d2 passed away) and I'm having a hard time getting the box tuning right. Tried using the calculator here but dont know how to view the plans/ cut documents. Any help is appreciated please. Here is what I have and it is horrid sounding.....

https://subbox.pro/en/design/?bt=2&bw=609.6&bh=254&bv=18.4&mt=19&fp=1&sq=1&ss=8&cd=187.5&md=160&sv=2.3&so=0&sd=20&sb=&sn=&pt=4&pq=1&rf=34&pd=83.58&pw=2&pa=54.84&pp=100

To see plans you must click on the "Drawing" tab, you'll see a list of the parts, then click on the part to see its layout. Look at the screenshot below.