These are the fuselage parts out of the box. To build the E-135, you have to shorten the front- and rear section (see description below).
Sand the parts until they fit properly.
And this is the E145 fuselage after sanding:
If you prefer to build the -135 you have to shorten the front and aft part of the fuselage.The panel lines on the kit (see the arrows on the picture below) shows the sections which have to be removed.
Now the fuselage is bonded. And the pictures below show you how the parts will fit (only sticked together).