Its easy enough to find plastics for, you can even get brand spanking new fenders that will fit it, problem is all your choices will be red! The Blue is a pretty rare deal, i have only seen one in person in all my years of collecting, trading and repairing trikes. They just arent very common around me, some guys on here might be hoarding some parts but blue fenders are always coveted parts that are hard/expensive to come by!
The aftermarket red fenders will also eliminate the trunk, its just not available as they were made. Try looking for a used set of 110 or 125M fenders on eBay, then you will still have the trunk if you want it. There is even a mmember of the forums reproducing the trunk lid and its associated parts.
Your only option otherwise is to go red and replace them. As for a rack, there was a hondaline rack for the 110/125 series that will fit it, not very common to find though, but they do show up on the market now and then. Overall i think you got a pretty decent runner for $300, slap on some fenders front and back and your in business. You could always take a set of red fender and paint them blue, but the paint doesn't hold up well and you will have scratched spots of red over time showing through.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....