Back plate is a good move, kit always looks better with back plate
TK parts are ok as long as they don't look like TK parts as far as I'm aware, field equipment can be used without modification.
My personal opinion I'd not use their bicep armour as your quite a light armour build and you'll start looking top heavy.
maybe equipment storage bands eg: flares or large caliber rounds, maybe small egg sized grenades.
best people to talk to are Ruus'alor's and App team members for clarification if not clear on the CRL's
Oh and that picture looks pretty bad shebs 8)