Ok,  
Here very simple examples for "cap ends", (results surface only) 
Useful or not`?, possible in conjunction with other Commands
 
(StraightSnapON, ObjectSnapON)  
TrimCommand__Add trim points__Done__select new edges__use BlendCommand "value 0"  
(observe seam, there must trimpoint get set, other trimpoint opposite)
  
TrimCommand__Add trim points (4points added)__Done__select new edges__use NetworkCommand (observe seam)
  
two trimed edges + line__LoftCommand used
  
 
SweepCommand used__edges is profil__middle line is rail (ShowPointsON)
  
__SweepOption End: PointyEnd__after "Done"
  
__Top most point selected__ moves to middle
  
 
BestReg`s EDDI  |