On30/O-16.5 RHDR hoppers and armoured hoppers

A rather strange design here, this is my attempt to recreate the ballast hoppers that were used on the Romney, Hythe, and Dymchurch miniature railway. A fictionalized version of these hoppers were also used on the Arlesdale Railway in the Reverend W. Awdry's Railway Series, I used what photos I could find for reference but also did some guesswork based on the illustration from The Railway Series and screenshots of the CGI Thomas and Friends series as frankly there's very few pictures of these and most of them are from similar angles so the details they show are limited. Also included are sets of armor plating that were used during World War 2 to create what I believe was the smallest armored train in history, which consisted of the miniature locomotive Hercules (sadly not included here) covered in armor plates and sandwiched between two of these hoppers. The hoppers in their armored state were each manned by two soldiers, one with a Lewis machine gun sat under the square opening, while in the ring mount was another with both a Lewis and a Boys anti-materiel rifle. This petite armored train was used for coastal defense and protecting the Pipeline Under The Ocean project and did claim to have downed German aircraft.
As usual I've included options for built-in coupler pockets, or empty space for mounting your own. To select which one you want just pick either "rhdr_hopper" or "rhdr_hopper_nocoupler." The armor plates come in two types, "rhdr_armor_complete" is preassembled but will require supports, while the set of files labeled "rhdr_armor_split" consist of several pieces that should print without support but will need to be fitted and glued together. If you're building the hopper without the armor you'll also want to print 5 of the "hopper-insert-x5" and slide them into the slots in the hopper body, if you want to swap between the two do not glue these in place as the armor shell uses the central slot as a locating point. EDIT: the bogies I included do not work, sorry but for now it looks like what bogies this will take remains uncertain. I've got a few spare bogies I'll test and update with info on how they work.
Finally I should note about scale: the real RHDR railway is 15" gauge and as such this would be more appropriate in On18 or O-9 scale, I didn't do that simply because I don't have an On18 layout and I do have an On30 layout. As such these are a bit wider than they should be for this scale, and might not fit on an On18/O-9 layout. Also these are closer to American O scale 1/48th than UK O scale 1/43rd, so if they look short you may need to upscale them slightly.