Did some research:

I am told this is birch wood (or something like that, sorry if I am using the wrong terminology). Am told (like Minnflyer said) that it good enough. I will harden with CA however (there is only one type available in my country) purely to put my mind at rest, lest I keep worrying about it.

The metal screw and blind nut (SCHS, again correct me if I am wrong) is what the kit recommended and supplied, but he didn't use it. I have one ARF with the SCHS and the other with nylon nuts in the wood as described above, but never had one with this arrangement.

Right now I have started to worry about other things: the Oracover monocote that my friend used is old stock and has started to delaminate. He should have stopped and informed me so could get something else. Now I will have to tape it all over.

This plane was 60% built by me and then I ran out of free weekends so he completed it. I messed the rudder in a way that the plane is going to keep turning left. Hope the large control surface helps me trim this out

Anyway, I am posting pictures"naked" plane (sorry for the language but I am still to apply decals and it is past midnight here) for comments

Ameyam