Ported cabinet for guitar amp

Hello,
I am trying to build a cabinet for my guitar amp. I have build other cabinets but this time is different and i need some help. I need to build a ported cabinet, like the tl806 but the speaker i have is not the famous electrovoice el12.
I m going to use a jensen tornado classic 100 8 ohm istead.
IMG_1011.jpeg

I have used an online calculator to get me in the ballpark, here the results

IMG_1010.jpeg

Now, my doubts, the cabinet volume suggested is huge, 126 liters it is going to be oversized for guitar amp 1x12.
Do you think these results can be trusted or should i use a better source?
I know the tl806 cab design has slots and not pipes for the bass reflex but i don t care, i m not trying to clone the design, just the concept.