>>8267693Frame Arms Girl isn't really a successor to Busou Shinki. Megami Device is the defacto spiritual successor line in a lot of ways. Pretty much all the key staff for Busou Shinki ended up working on Megami Device including Masaki Apsy, the designer behind the MMS body system; Toriyama Toriwo, the producer behind Busou Shinki's figures side; and even Karashi Ichi, who did the original introductory webcomic for Busou Shinki. A lot of the artists who did Shinki designs also contributed to Megami Device including artists who were supposed to be credited for unreleased Shinkis, Jill Rivers, Estoril, Flamberge, and Corsesca. Specifically, the SOL series of Megami were designed as a collab between Kuroboshi Kouhaku working on the character designs and Yanase Takayuki working on the mechanical design like the bike Shinkis would have been and the Chaos & Pretty series of Megami were designed by Nagi Ryou as the blade Shinkis would have been.
If Megami Device were available as completed figures, that probably would have been ideal for a lot of older Busou Shinki fans, but most people seem to have gotten over the fact that you have to build your own girls now. Pre-built plastic models end up devaluing the kit since a lot of the value is in the act of building the kit itself. If you look on ebay, prebuilt stuff is usually just junk.
As for armor sets, there aren't really anything like that. Kotobukiya does sell a lot of accessory packs for Megami Device, but they tend to be expensive since they're all essentially garage kits.
Knock-off Frame Arms Girl kits tended to have worse QC than the real products and some more modular armor pieces to the kits were fused into one, limiting customization. Another thing is that they would plagiarize customizers off of twitter. They're also no longer in production since the company that used to make those recasts have moved on to making original kits instead.
