@gtaus, how do you get the chicken poo into the cement mixer? Do you have to dismantle it, remove the plastic bucket on the front end?
I use a dry deep bedding method for my chicken coop litter. The chickens poo on the bedding and it automagaically disappears in the deep bedding. Twice a year, I clean out the coop and toss all the used bedding into the chicken run to compost in place.
I don't use poo boards or anthing else to gather chicken poo by itself. It's always integrated as part of my coop bedding and then in the compost out in the chicken run.
My used coop bedding turns into compost in about 2-3 months outside in the chicken run. However, I have so much excess litter in the chicken run that I can harvest as much compost anytime I want. Last spring, for example, I built about 4 new raised beds, filled them with huglekulture wood, and topped them off with a topsoil and chicken run compost mixture 1:1, and only used less than 10% of my available and ready to use Black Gold compost out in the chicken run.
I posted an in depth explanation of my cement mixer compost sifter build at How to determine quality of different types of compost? post #22 dated Aug 31, 2020. That should answer your questions about how I modified the cement mixer to turn it into a cement mixer compost sifter.
I got the original idea of converting a cement mixer into a compost sifter from some YouTube videos I watched. However, they all required you to drill into the cement mixer barrel and make permanent holes in their system to attach the compost sifting barrel. I modified the setup so that I would use hook eyes and turn buckles instead of drilling holes into the cement barrel. IMHO, that is a big improvement because if I ever want to use the cement mixer to make cement, I can easily take off the shifting barrel and still have a complete cement mixer barrel without holes!
But the really short answer to your question is that I did not have to remove the cement mixer barrel, I just added the compost sifter barrel to the end. This picture should show you my modifications to the build so that you don't have to do any drilling and/or removing part of the cement mixer barrel...