Ok combat questions.
1) Is there a melee penalty with blasters?
2) Is there something akin to an opportunity attack for leaving an adjacent square?
Actually a glow rod is only 10 credits.Well, I'm not sure Rico would know that information, would he? I mean, it's not like he's communicating with Rex is he?
But the AT-FRC walker is to his southwest. Normally its sensors extend to Medium planetary scale range (~50 km), but Rex managed to reduce their functional range to Short planetary scale (up to several dozen km, which I interpreted in the uneven terrain of Kabal's rainforests as 5 km).
I believe the intention with droid PCs is that you only have built-ins that are described explicitly in the species description for droids or that you purchase. This is to avoid a droid PC starting with lots of free equipment "because droids in the movies had it."
If a Fusion Lantern was overkill for what you wanted (it's a light, heater, and power source), I think it would be reasonable to include a built-in flashlight (50 credits, encumbrance 0, rarity 0) if you wanted and had the money to spend.