Consult for a HVAC Design Solution

Hi. I would like to get some advice from a experienced HVAC systems engineer/specialist. I currently have a rough sketch for a design and would like to consult before building a prototype unit. This is more of a mini-consulting job. I would not take a lot of your time. Less than two and half hours. Most probably for a Skype session where i get the experienced expert to address my design concept and help clarify some aspects for me. I will upload the solution and some of the key questions that i have. The result of the consulting session should be a validation or recommendation of how to go about designing a solution that will work. detailed answers some some questions that will be shared in advance (see attached) i have three attachments that i have shared 1. The circuit 2. How it will be retrofitted into a locker unit 4. Key Questions. Some of the provisional BOM are: 1x compressor 1x oil separator 1x condenser 1x liquid receiver tank (including solenoid valve) 1x filter drier 1x sight glass & hermetic moisture indicator 2x thermostatic expansion valve (1 per evaporator) 2x evaporator (1 per temperature range) 1x pre-cooler (heat exchanger) 1x suction line accumulator 1x crankcase pressure regulator (CPR) valve xx insulation boards (probably polyurethane) xx piping I would really appreciate the assistance. This will be a purely advisory role. Regards