Is it possible to swap out for an ICS aeg grip do you think? I think that's what WE based the receiver dimensions on- might be worth a try anyway.
Assuming it's anything like the AR-15s I wouldn't worry about "because otherwise they'd be fucked so fast they wouldn't be worth owning" the internals last quite well although my mate's 416 has had quite a few issues with the ra-tech parts. The steel bolt doesn't function at all and the trigger group springs up problems every other week- If yours end ups having issues, have a look at getting a CWI trigger set, they're meant to be much smoother. However that is based on the AR-15s so may be completely transferable to the l85.
Shame about the grip though, people complained about it when the gun was first released, you'd have thought they'd have done something to sort it out by now.
How does it shoot so far though- hopefully something of a brighter note?