Thought I would share my work-in-progress for Mr Handy (Type I - the ones you see in FO3 and FO:NV)

Items:
1 Flying Base (I use GW, but you can use whatever you like)
3 Cabochon Beads (1/4 inch diameter - .5cm - I got mine in a Crafting Beads Mix by "Jewelry Essentials" at Michaels)
1 Starwars(tm) Miniatures Line Octuptarra Droid
Step 1:
Trim off the orange nubs from the laser cannons (but not the cannons themselves) and cut the miniature legs as seen in the picture.
Step 2:
Drill a hole in the center post for your flying base. (Not pictured)
Step 3:
Take the laser cannons and fold them up to the body and glue them there (I aimed to have them where the 3 lines bisect the central sphere, made a nice angle)
Step 4:
Glue the Carbochon beads (flat side out) where you joined the laser cannons to the body and glue them there.
(The rest not pictured)
At this point its really up to you - if you have the bits to make blades and flamers and plasma weapons go ahead and add them to the arms - sadly I did not, so I am still searching for bits that I can glue on to the arms. In the meantime the last steps are then to:
Prime the model, Paint the model, glue model to flying base.