hi again,

so I知 going to be likely making a home brew style formed WFO.
ill attach a pic of my base that痴 nearly complete. Excuse the mess.....
What I知 stuck with is the base - I知 wanting to make a concrete work top.
What im wondering is do I need lintels in or is reinforced cement strong enough ?
that led me to this could I do half reinforced cement 3inch. 2inch vermiculite and cement for insulation?
sound great in my head but so does my singing voice
any suggestions ? Basesize is 1300x1300.
Will I be able to lift this with a couple of people?