So much so, in fact, that he wanted to buy one. Bear in mind this is a significant investment for a 6yo. He had to use all the money he had saved for a significant period of time and then do a few odd jobs round the house for the rest.
In any case, he ordered one and it arrived. He then spent a happy evening putting it together.
It's quite a big thing to paint, so we cracked out the airbrush. He's been using the airbrush since he was 4 when I got him a cheap Spitfire to paint, so all I really had to do here was mix paints for him and tell him what colours to use.
Once he'd basecoated it, I painted in the black of the wing phalanges and the back plates. I also added the lighting effects on the base and tidied up the face.
It's a model with a lot of presence and he seems happy with it. I live in fear that he's going to want to play the Middle Earth SBG and field it - in the new rules, the Balrog is an unstoppable beast.