Two weeks of evenings? What, like 16 hours? You're going to spend hundreds of hours and $2000 retrofitting to a toy controller and it's still going to be a KMP3 at the end - if it even works. How many retrofits end up sold as boxes of parts?I think I am done. Two weeks of evenings and I am ready to gut it and do an EMC2 retrofit.
Do you know anybody that that wants to buy some boards and parts?
Sorry to be kind of blunt. Think carefully of what you need to spend, what your electronics skill level is, and how much time you have. Then triple it all.