Ive ordered my 25th anniversary box and am waiting anxiously until it arrives

What I can see though suprises me a little. Most of the mechs that they show have really thin arms and legs

Now I get that not all models in the box ouwld be premium quality but the thin arms and legs seem abit cartoony to me... Are all boxes like this or are these exceptions?
And if theyre like this how hard is it to fix? I already play games from games-workshop where they have green stuff, which is basicly a putty that you can use to fill gapes and shapes parts of a model with. Would this medium work to get the models to look abit less... Wonky? Buff up the arms/legs, add missle racks and other such things?
Thanks in advance
