I have built most if not all of the master/expert level kits from Estes. This turned out to be a really satisfying build and requires skill. The finished product is impressive and I am looking forward to its first launch.
The two issues I see are:
1) The main body tube is short. Meaning your chute packing etc. WILL be charred if you don't use wadding properly. I suggest a more durable shock cord like longer Kevlar. The rubber will break on the first or second launch.
2) I am sorry to say this, but the instructions are junk. In one place they have you cut out a template that if done, will ruin steps not yet completed on the back of the page. READ AHEAD and note what to do before cutting out the tube marking template.
Estes makes GREAT kits. But they really need to invest in proper instructions that kids of all ages need to READ, or at least actually use language that reduces ambiguity. Great kits but the instructions (on this kit and all kits) are poor.
This is just my input. This kit is great! However, if one is less experienced, I can see where the instructions would be a source of frustration. If you are new to this level of building, GO SLOW.