A suggestion for hideout room.
Motivation Unit generator that has 10 levels and each level grants 1 motivation unit. The first room can be obtained at hideout base 25, second at level 35 hideout base, third one you get at level 45 hideout base.
This room will push people to expand their hideout and get a benefit of having a higher hideout base level. The way the hideout is currently designed; it is highly beneficial to stay at hideout base 20,30 and 40 until everything is expanded to gain the most resources from hideout fights and collecting from mines and factories.
The time to create the motivation unit can be similar time it takes to make a modification. Once collected the motivation unit would go into the players current daily total which means they would have to be used the same day.
The developers could add a larger Motivation Unit Storage for for real money or large donut purchase similar to the 99 donuts for more remote controls/batteries.