Looks good man! Were those used arms and subframe you painted? Or are they new?That does appear to quite significantly corroded under there but as pointed out it's all essentially surface rust on unboltable parts so easy enough to remove and refresh.
My latest Cupra R had its fair share of grot beneath its undercarriage but the chassis was sweet so of no real concern as I'd planned on pulling it all off anyhow.
I had spare subframes, wishbones and all new suspension components so plenty of prep work and several tins of Frosts chassis satin black and I ended up with this lot...
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Ya I think I'll give the surface rust my best try with a wire brush and drill next weekend.