The usual thing is for the slats to come out with the first selection of the flaps to
'balance' the wing. No matter what flap selection is made, (take off/land, 20 degree's etc)
I haven't built the Italeri Tornado, but if it's anything like most of the others it will be missing the wing bags, the seals in the fuslage into which the wings sweep. Without them the model will look silly, with them you won't be able to sweep the wings if you want to when it's built. But then you'll have to move the pylons, and they usually snap off anyway!
Pete