The yellow wouldn't be as you want it if I make it darker, and if I use it on the M admin text it's Ok only with a contour which is ok if you like it, but I wouldn't recommend it. Are you considering any other backgrounds other than white?
Also, I would like to say a few words about the concept. It stands for an abstractization of the hard worker you are aiming at, the dynamic individual always on the run. Crowding your logo with every little object that has a connection with your bussines is something that again I wouldn't recommend. From my experience I can tell you the clients I've worked with in their majority want the logo to be explicit, forgeting about the fact that it may be to crowded and may not transmit a unique and identifiable message/feeling. Take this into consideration if you will.
Good luck in choosing your logo and I will be available for any requests you have.
Thank you!