I've "managed" to get many non-wargaming modelling projects into the DDakka gallery with few problems.
The important part, to me, is the word "modelling". The skills and techniques used to build and paint any model is relevant to wargaming models as they are mainly the same.
Also, the P&M blogs section is generally quite relaxed about what is discussed in a blog. A non-wargaming model is perfectly fine from what I've seen.
The only problem
DD has with non-wargaming subjects is having said things uploaded to the gallery. But there is no problem with pictures if they are hosted elsewhere (e.g. facebook). So that can be used if you want to stray further from wargaming in your blog.
But, as I said, a model is a model, and therefore is relevant to wargaming.
Just note that this is my experience and I am not a moderator, so I'm not an official spokesperson for
DD.
Good luck with the model.