Could player discard nearest cards to place the part of `War Machine` in proper order?

Question

Suppose, player got a part of War Machine after attack. Could he discard nearest cards to place the machine in proper order, even if he have another rooms ?

Answer 1

No. You may only discard other cards if there are not enough open spaces. From the Fantasy Flight Chaos Marauders - Card Reference (page 14), regarding taking War Machine parts:

... He must then place the cards in his own battle lines - If there are not enough open spaces, he must discard cards to make room.