Hey there, I`m quite a Ma.K builder myself and have been since 1984 so, I can shed some light on this for you.
At one time the Dora and the Melusine did have the nitto kits with them, now if you were to buy them ,they only come with the conversion by itsself.
The nitto kits you will need to complete those two kits you will need the Gustav for both.