Looks good.
what i would do with the paint though is add more shading.
You basicly start with a darker shade of the colour you want to use and then work it up to tha actual shade you want it to be. Trick here is to leave a bit of darker shade exposed around edges and holes.
Personally i think it adds more to the complete picture.
Practise makes perfect, so don't bang your head to hard about the bonding and sanding. now you know and you can thake that knowledge and use it on your next project.
Other then that, i'd say you did a well enough job.
Sincerily yours,
Engineer.