Matt, that is a simply stunning build.
Although I'm usually an aircraft builder (hence the avatar), I'm seriously tempted by one of these. Having looked at the AFV shop site, I see that some of the resin parts are eye wateringly expensive. I usually factor in about 50% for upgrade parts but for this particular model, that probably won't be enough.
I wonder whether you'd be kind enough to to share what you consider are the 'must have' and 'nice to have' options.