Im Just asking, but are there standard cell for an OpAmp already? And could I attach my project to someones Wafer design? I really only need 6 OpAmps for the first test on silicon, as well 10 IO Ports...

You can search through the existing posted projects, as a number of them implement operational amplifiers, although of course you need to provide some kind of spec as you can't necessarily substitute one op amp for another.

Basically all Specs of the LM324 or better... It is only used for rectifing a Signal from my model Railroad... I get 3 wires in and need them rectified... It defenetly needs to bei small and efficient... All commercial options are to bulky... The OpAmps would be only for driving 6 small MOSFETs externally...