100# LP tank RF build -in early planning stages

Hello all,

I have a few questions:

Trying to find the ABSOLUTE volume of the 100# tank for planning.

Mine is a Manchester,they list it as 22.9  Gal LP on their site.

To my knowledge they only fill to 85% LP or so,please advise....

Anyone used a 40#  LP tank for the FB?

Rough calculations say it would be a good size but seems a little thin walled.

I would also like to see pics of similar builds.

Thanks in advance,Bill