4.20 is Impossible (but not impossible). The bomber conversion itself isn’t overly difficult, but making sure you have ground crews within unsa territory able to perform any maintenance and refueling the plane would need most certainly is, amplified by the fact that you’re not just using any engines, but engines fueled by drugs a relatively new and very much government controlled resource. It’ll either be difficult to maintain opsec or difficult to convince anyone the airline isn’t an SFS asset thanks to the engines, which in turn makes it more likely them decadent pig dogs will keep their lips sealed (and therefore reduces the chances of successful intel gathering, which is ultimately what the difficulty reflects). Gavrilium-based technology making its way into civilian hands within the federation would do wonders to reduce suspicion.
The marksman’s rifle is Very Easy due to the combination of the relatively mild demands and a little bit more firearms experience than you started the game at.
Sak-2 is Hard, with a fairly easy engine swap complicated by the inclusion of a fly-by-wire system kept only barely out of Very Hard thanks to the (limited) work with electronics done with the gitgud.
Li-GG is Normal, since takes what the 4.20 wants to do and removes the excessively difficult part.
The Evaluator Iteration is Trivial, it is very focused on a very specific part and it’s very specific issues. “Do better” might not be the cheapest plan or achieve the most effective results, but it’ll certainly do something.
Waffles are Very Easy. There’s a little more work being done, but it’s also much more likely to have a better impact than the above unless you’re really unlucky. (That is unless I’m very unlucky when I roll)
The Rasergun is a design and will need to be reproposed there for an estimation.