Yeah, it'll be very hard to replace or at all, since some components are even sometimes soldered directly onto the motherboard...
Plus it'll cost too much if you could to be worthwhile, changing the motherboard, to replace the processor, to replace the RAM.
You might as well buy a new laptop for how much it'd cost you...all you'd have left is the case for $80 after tampering, so not worth it
So you could buy a new laptop (for less than it'd cost you to change parts in that) for about $<450 with those specs.
I hope this helps