could be 'Round Corner' by Fredo is your friend...

when this is your solution

here a little step by step

mark the face of the type. use offset inside or outside. push/pull the additional face select the face offset again select the inner half face
7 use round corner (sharp corner Blue icon)
8 set one face
9 move your mouse pointer outside your selection
a green check mark apear. than click. the plugin generate now your faces
10.group the face this will appear after working. offset the face

now you have the same like in the attached SKP

2015-11-14_19h12_09.png

2015-11-14_19h12_28.png

obnet_v14_new.skp