Vod - The prevailng wisdom is to fit your soft kit to you, and then to fit the plates to the soft kit. You can certainly get plates cut and rough shaped before your vest is complete, but you definitely want to have your plates final shaped, and your mounting figured out before you paint your plates.
Okay, cool cool. I had a strong hunch that was the case but just wanted to make sure. If anything, it helps me stay on track of "focus on one thing at a time" xD
Vod - The prevailng wisdom is to fit your soft kit to you, and then to fit the plates to the soft kit. You can certainly get plates cut and rough shaped before your vest is complete, but you definitely want to have your plates final shaped, and your mounting figured out before you paint your plates.
Regarding separate colored sides - check my soft parts WIP. I put side panels in that are a different color (natural linen color, not blue, but same difference).
The side panels are part of the closure; they have 2" wide velcro on the inside to align the front and back, and I added external straps/buckles for extra security and The Look.
Oooo, I really like that, thanks for sharing. Admittedly I didn't scour
all the WIPs for ideas on the vest, but the ones I did manage to find that were doing that sort of thing all seemed to have a more open design rather than closed. Hoping to get more of a heavier IBA look than the lighter Plate Carrier look, so I might be
stealing taking some inspiration from this design xD
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For an actual update on my progress:
Hasn't been too much cuz work and other pesky real-life things keep taking up my kit time xD I have been able to get most of the pieces cut out for a prototype from some thrift store curtains so that I can make sure I got the base sizing right, so I can test out some ideas I have for a few of the details, and to make sure I still remember how to sew after all these years xD here's the pieces so far:

If I did it right, I've got the front pieces, back pieces, yoke, sleeve, and lower "pockets" done. Gonna try to use the pocket templates for knee and elbow reinforcements and, for those, I'm thinking of maybe trimming them down, giving them 45° angles on the corners, and putting some horizontal stitching on them to give them a "stronger" look. Still gotta cut out the sleeves and the "normal" front pocket template that I'm planning to sew completely on to give it a sort of thigh reinforcement. Also thinking about trying the horizontal stitching on that as well.
Only have 1/2 the collar cut out so far as I've hit my first speed bump with this. The pattern calls for 2 of them to be cut out and for it to be cut on the fold. I had gotten these so I could mark everything out on the first cut piece before removing the template and cutting the second:

However, I think I've gotten the wrong things xP They're Dritz fabric marking pencils but, when I tried using them, I only got the faintest line after several passes. Tried light and heavy pressure but never got more than the faintest ghost of a line. Just wondering if these are the wrong pencil for what I'm using, if I just got a lemon, or if there's just something arguably better to use? For reference, the curtains are a heavy-ish cotton.