Trying to SPILL a large multi-step formula

Trying to SPILL a large multi-step formula with each SPILLED cell representing a step in the formula

=((([@A1]/4)^1.25+(B1)^1.3+(C1)+(D1*10)^1.125+(E1+1)*(F1+G1/2+H1*2+1)/80+(I1*30)+(J1/2)^1.125+((K1+1)+(ABS((L1+1)*8)^1.125)*SIGN(L1)+[@M1*3)/8+((N1+1)*(O1/4+P1+... and so on.

Each plus sign is a "step in the equation" where I'd like to display the result.

A LET function? Index?

Thanks!