aussielori reward upgrades from J to F may only be made by members of Privilege Club but reward flights may be obtained by members of any Oneworld FFP. If you have the Qpoints and there is space available then anyone can obtain upgrades from J to F.
There are two First class lounges at DOH. Al Safwa is the premium First class lounge and the First class lounge is for top level members of the Oneworld alliance
Is DOH a transit point or the final destination of your journey? If it is your final OW destination then you will have no access to either lounge.
If your transit is more than 8 hours then you will have no access to Al Safwa.but you may have access to Al Mourjan premium Business lounge.
Access to Al Safwa lounge is dependent upon how you obtained your upgrade. Upgrades with Qmiles at the airport do not give access to Al Safwa. Neither do most E-mail offers. If your transit time is over eight hours then there is no access.
In this post Qcredits, Business anf First class lounges are ignored since they require status.