When can the GUI client roughly be expected (dont want a guarantee just a rough estimate)? Would that GUI client go along with an easy installation?
Two other questions I have:
How many developers are working on counterparty right now and are they full time?
I assume counterparty is working on the bitcoin blockchain which means that transactions/contracts are facilitated by bitcoin miners. Correct? Would it be possible to migrate to an own/different blockchainl with counterparty? Any plans here?
The community has multiple desktop clients in the works.
Regarding a web-wallet, I have posted a written tech preview of "Counterwallet", which is the upcoming deterministic web wallet the Counterparty team is hard at work on. Check it out on the counterparty forums at: https://forums.counterparty.co/index.php?topic=79As I stated in that thread, screenshots should be coming by the end of the week. Things are moving along very well.
As far as your other question goes, currently Phantom and I are working on Counterparty (pretty much) full-time. We have future plans for additional full-time devs.