Tolga,
           Simple production process by Hughes Carlsbad for years.  13 =
microns of resist, create lift off profile using image reversal then 7 =
microns of Indium for the bumps.  Totally repeatable for at least 7 =
years.  Contact me directly for more commercial details and technical =
papers.  bmoffat@yieldengineering.com  Bill Moffat