I didn't really do any financial estimations on my side.
But players who could fit into this roster are quite rare. I think to complement lack of rebounding in 1-3-1, you'd need a roster with high overall rebounding.
In my head SB helps with lack of rebounding in defense, because you have to expect losing on rebounding most of matches. That means more shots from oponent which can be mitigated by SB.
But I was also toying with Princeton or some outside tactic to complement 1-3-1. Which is in general weaker than inside offense vs most common 3-2, but most of the teams playing it are playing SB bigs, so you don't really need the 2 inside, since their bigs are not offensive threat. So cheaper outside offense should be enough to push through.
Creating team like this will take couple of years, it might even be homegrown which is even harder. I think you need standart 2x SB OD ID bigs and standart perimeter attackers, but you need more RB in every position plus SB on perimeter.
Thinking about this, it might be too much for player potentials even if not playing princeton which also needs solid passing.
I guess we'll see in 3-4 years how it played out :-D