Answer:

$\dim(d_V) = \dim(d_E) = \mbox{weight} \, . \, \mbox{length}^{-3}$. Six parameters: $\frac{d_V + f_1 d_E} {d_V + f_2 d_E}$, f₁/ f₂, (d_V + f₁ d_E) V_b, V_b /(f₁³ V_m), $\dot{k}_M^{-1} + f_1 V_m^{1/3}/ \dot{v}$, $\dot{k}_M^{-1} + f_2 V_m^{1/3}/ \dot{v}$. In conclusion we can state that these compound parameters are not very informative. Knowledge about the values for X cannot be used.

The parameter $\dot{v}$ is not estimatable, because it has dimension $\mbox{length}/ \, \mbox{time}$, but no lengths are measured.