An implantable pulse generator (IPG) is fabricated by utilizing a lead body with a plurality of conductors enclosed in insulative material along a first length of the conductors, and a second length of the conductors being exposed. A tubular structure is placed over the lead body with the plurality of conductors extending through it. A feedthrough assembly includes a plurality of feedthrough pins surrounded by insular material with a ferrule extending about an outer surface of the feedthrough assembly. The plurality of conductors are attached to the plurality of feedthrough pins and the ferrule of the feedthrough assembly is welded to the tubular structure to form an intermediate assembly. The intermediate assembly is then welded to one or more housing components of the IPG providing a hermetically seal. A connector portion on a distal end of the lead body is provided to electrically connect to terminals of a stimulation lead.