The main reason why I bought this ahead of time was because of the discrepancies I saw between the listing and my CAD model. For example, the listing title said there are 22 slats but the image has 23.

I opened the box -- which stated it was 19kg by the way -- and as I expected, they have used some rather nice looking wood for bed slats. They've even filleted the faces that come in contact with the bed. I feel it's a little bit of a shame that, for most buyers, wood this good is literally stuffed under their mattress.

The first slat is the only one that's stapled 4 times on each side. The remaining are only stapled twice and I believe the reason is so that it can be packed in the box.

The hole is 4.2mm and I measured 12mm from this edge to the centre. It was 13mm on the other side and the slat was 1199mm, so I'm going to assume the holes are 1175mm +/- 1mm.

I unpacked them all and measured 2086 - 2087mm from front to back. I counted 22 slats. Assuming a nominal 45mm slat, I've used 52.2mm as the spacing distance in Autodesk Fusion.

Due to such measurements, I've been able to streamline the design and make a BOM list:

I'm going to use 6 mounting points for the wooden roof since the tubing is closer to the edge and they're not weighed down by a mattress. I'm also going to try and see if plastic end-caps can be used as feet. For the weight, I have used 16kg as claimed on the listing.