MMCC
Though we may include some information on the MMCC for those who want it, we do not represent them in any way. You should contact them for in depth MMCC assistance.
How to submit your costume for approval:
Start at the forums
Step 1: Create a profile on the MMCC Forums https://mandalorianmercs.org/forum/index.php
Step 2: Make an intro post on the forums for your local chapter aka "clan".
Why the forums? All official mercs business goes down on the forums, as well as years of information, troop notices, how to guides, etc.
Find them on Facebook
The MMCC has an official Facebook group for building your kit if you wish to join. You can find that group here.
Many local chapters "clans" have their own Facebook pages, both private and public facing. You can reach out to them there for immediate help as well.
Make a WiP Thread
You are also required to make a WiP (work in progress) thread on the MMCC forums. You should post pictures and info about what you are making so you can get feedback and we can see what you've got so far.
For your WiP thread, adding images is best! Images are best added to the forum using IMGUR. There is a great tutorial how to do that HERE.
You will need to make a WiP thread in the armor construction boards (here).
The MMCC has robust CRLs (Costume Requirement List), that vary by mando era and styles. You should consult their site directly for more details and even more in depth information.
MMCC user Havelock from the education team has an excellent UM to OM thread on the forums (found HERE) with a great breakdown of east step along the way.
You can simply click on each arrow next to each section on their site to read the requirements for each item.