…at least big bars are back ‘in’ at the moment, as it won’t feel quite as weird swapping over like a few years ago when they were all 4″ narrower.
Slammed seats are a bit odd though, especially if you only ride xc usually and are used to having something between your legs.
Don’t bother with pegs, gyros or any of that nonsense. Front brake is debatable, no one really bothers having one (unless they do a lot of front wheel tricks) but it might be worth keeping it on for a little while if you haven’t ridden without before in case of panic/emergency grabs. 😕
If it’s just gonna be used at a track then get a race bike (alu or 4130) but if you think you might do some dirt jumping or street/park stuff then a long’ish trail/park frame will be stronger, if slightly heavier.
p.s. where are you based and where are you riding?