Thanks for the kind words. Mike wrote the LCD instructions, I wrote the paper that the LCD instructions are based on.
I make my living as a circuit designer; very advanced and expensive telecom circuits and systems, I've been doing this for nearly 30 years. If you have the necessary electronics backround, a current source like a VCCS is child's play. BTW, a VCCS is only 1 of many available current source designs. Since I don't know your backround, I can't say if it would be easy or hard for you.
You need to start by first determining two things; the maximum surface area you want to do, and the maximum current density for want to operate at. Based on these decisions, you will be able to see if you have the right components. If what you have isn't right, you can adjust max surface area and/or max current density so that it is right.
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