I can't recommend any closed end kits, but I have recently been making closed end pens out of two part rollerball and fountain pen kits (pictured my modified Leveche and Cyclone kits).
It's simpler than it first looks.
I do the cap as normal and then the barrel blank is cut a bit longer (10mm ish), drill the blank one end the depth of the tube and glue in as normal. Then I make a jam chuck/mandrel type thing from a wooden dowel to fit (see pic), turn with tail stock up and finish with tailstock out of the way.
It's definitely worth a go they look great finished.