Final build done.

Damn! I won't be able to reproduce it
You look to be the unlucky one with TanTan. Many seems happy.
Your experience worries me obviously, but statistically it should be good 

Here was a typical way I look at a product:

I see it sold locally.
Then look for it on Aliexpress or Alibaba.
Generally I find it for much less.
And I buy it.
You just need some patience, but they are getting better at it.

For bigger purchase I check with the seller if they have a better shipping condition about taxes.
All rare troubles I got: poor product quality, product lost, mistakes were settled either directly with the buyer or by Aliexpress.

A product with many orders and very positive reviews is almost always good. A little of common sense is needed.
Beware people are entitled to leave a review when they just received the item.
So for longer term reviews, you need to dig in the reviews.
Then check the bad reviews, some are people that try to put their own mistakes on the seller, and some are enlightening.

Now, if you think about it, there is something really wrong and unsustainable in all this.
Everything is built there, and shipped here for nothing.
But there is no point to pay someone here a $300 markup for nothing on a $160 fork either.
As long as it works, I'll do it.

Thanks !

Who is your contact person and email at TanTan ?
I'm looking to build a couple of hardtails, and could start working with them.

Received (cleared by customs: authorized without tax or import duty): Perfect like the pictures from OG-Evkin (65mm version).

I suspect Belgian customs did read this.
I've received the form to fill in and pay the VAT 

Did you already see that one ?
http://www.carbonda.com/road/gravel/80.html

They have a lot of local distributors. Several in Belgium, where I picked some of mine up ;-) (a few years  ago)

Thanks again. I didn't see it on their website. Good news, to motivate me to paint a next build.
I'll ask my sister who's art teacher some advice 

They are one of the newcomer, at least here, with a shiny website. In a sense they are right.
Most folks feel better buying a brand. Think Yoeleo or Winspace.
They can sell it at higher price, and the customers feel they get more value, making everyone happy.
You'll end up with a logo