Here are some pictures of the gr045. Conveniently I am also selling this frame because I don't need two identical bikes. Shoot me a DM or check my post over in BST forum

Anyway there are a few differences between the gr045 i received and my norcross:

1. the gr045 has a separate crown race unlike the norcross which has an integrated crown race with the fork. It's probably MUCH easier to find compatible headset with the gr045. Otherwise the fork design is identical to the blue. Standard 1 1/8 steerer clamp area.
2. The headset allows normal stems and bars to be used with semi internal cable routing
3. there are more mounting points on the gr045.

Everything else is the same. I would be very surprised if it isn't the same manufacturer as the blue.

Just received my tantan gr045 today. Ordered on sep 14, received oct 18. Frame looks very high quality and tantan included the correct hardware I requestied. I will post some pictures later! Admittedly I have been riding a blue norcross that popped up used on ebay for a great price. The geometry is not traditionally CX but works well. It's extremely stable in fast corners thanks to the slack hta, but it is still nimble and sharp thanks to the short chainstays and 67 bb drop. The longer wheelbase and front center make it a little slow in REALLY tight corners but I think the compromise is worth it. I run it with 170 cranks and I really have to lean it far to strike my pedal. It does take a little getting used to but so far I like it. I feel like the front tire communicates very well how much grip you have and it's easy to correct a slide. The frame stiffness and ride quality has been great, it picks up speed quickly and holds it well over choppy terrain. I race a lot of XC in the summer so the long reach and slack hta works well for me and feels pretty natural. For a more traditional CX frame experience, I would stick to the gr029 for it's "normal" reach and hta.

The norcross/gr045 will also be a great gravel bike in my option, I can already imagine it bombing down a loose sweeping gravel hill confidently.

I just ordered the tantan gr045! It has the exact same geo as the new Blue norcross. I believe tantan is the same mfg blue uses for their production bikes.

This is an interesting cross bike with long reach and 70 hta and longer front center than most cx bikes. I think its a great mix modern and classic cx geo.

Ordered from tantan's alibaba store. Will report back when I receive the frame.