Hi Eddie,
I think the sky's the limit really, 3 boats at once is the optimum for me, with maintenance on the rest of the fleet ongoing !
Currently, Cossack, The Comanche Cat, and a 15" version of Vic Smeed's Silver Mist + a branch line station 00 Layout.
Once that lot is operational still want to build HMS Belfast, maybe a Christmas start 
Looking out for 6' 6" length of MDF for the building board !!
Regards Ray
Edited By Ray Wood 2 on 11/09/2019 13:25:52