Ares HPA ‘drop in’ gearbox in an MP5?

[The_Lord_Poncho]

I know of at least a few members on here that have an Ares HPA drop in gearbox, but I’m hoping feedback on this question won’t necessarily be restricted to those ‘early adopters’.  I rather like the idea of building a relatively quiet MP5SD based around the Ares HPA gearbox  - the gearbox choice being only as it would seem to be a pretty cheap option. As it is something that will only likely get the odd skirmish here and there as part of a rotation of guns, rather than get heavy use, I’m a little less worried about potential longevity issues.

Whilst I am mostly an AEG user, I do like to mix it up with HPA (a few semi auto Mancrafts in M4s, a Mancraft bolt in an L96, a few Airtac adapters etc).

Looking at the Ares gearbox, I would need to change the trigger, probably the nozzle, and the selector plate in order to fit it in an MP5. Is this everything? And do people think it is doable or problematic?