For what you basically have, I think you'd be better off with a Mother-32, Neutron, or something equivalent unless you're dead set on the VCOs you've selected. Then slowly add a skiff with some modules to compliment or augment what you have. If you're going to stick with your skiff (nothing wrong with that), you might want to add a buffered mult so you can supply both oscillators with the same control voltages and gates. Passively splitting CV that's controlling pitch can cause issues with accurately supplying the intended voltage to the 1/v Octave inputs.