Bryris,
I would wait until you have everything before starting construction.
The instructions always tell you to build the plane and then install all of the gear.
I strongly disagree with this sequence!!!
In trying to get your motor and servos mounted you are constantly moving the fuselage around. If the tail feathers are attached you have a high risk of damaging them! The risk is higher with a low wing since you have the fuse upside down on the bench, resting on the vertical stabilizer.
Yes, there are tricks and devices to help minimize the risk - why take it if you don't have to?
Good luck on the build!!!
KW_Counter