This is my on-going thread to document my progress through the 2021 Collab Project.
Cart with shared geometry Linked (Alt - D) and edges marked sharp on the handles and wheels.

End of Week 2, Day 1, Progress.

1) Final Low Poly Model (sans bevels). I also happened to look more closely at Vadim's artwork and I noticed his cart has a small curve to the top most rear plank, so I've decided to added it here to better reflect Vadim's vision.
harbinger_ua

2) And here is the cart with all the linked objects hidden.
I also lengthened the "handles" to better match Kent's block-out better.
@theluthier
duerer
Love the work you're putting into this
vincav81. Working smarter instead of harder, picking up on subtle curves, rebuilding a second time...all signs of a bonafide 3D modeler 💪
vincav81 I would prefer the version from your homework. The other model looks too perfect like an industrial product. I just would reduce the gaps between the boards (there's nothing shining through at the backside or right side of the cart box):

I wanted to add metal tires to the wheels, but know I think that that would just ruin the simplicity of the 1st cart.
As far as I know, there's often a metal ring around the wood wheel in order to protect the wooden part against hard hits from stones etc. on the way:

Andrea
elubie added it to her "Homework Submission Cart" here (scroll down to the orange frame).
Progress Update: Medium Poly model for Sculpting.

1) Beveled mesh, ready for Hi-Res modifier.

2) Cart with Subdivision (Level 2) added for visualisation.

And for anyone else wondering how to turn on the Polygon/Mesh counter that Kent uses, it's under Viewport Overlays and called Statistics. And if you tick that you viewport should also look like this:

Without the red annotation of course.
Here's my updated Low poly cart following your advice. I set the single bevel to be 0.0035 (Offset). Which does mean that I have to copy over the handle s and make them into new Medium Poly versions, which is no real loss because adding the bevel to the low poly has fixed a mesh issue I was having with the Medium version handles I posted about below. Thank you
duerer
And I also adjusted the spacing of the planks on the back as well.

Cart UPDATE:
After going over the mesh once more (perfectionism strikes again!), I now hope that I can actually start sculpting. HOORAY!

1) Low Poly version shaved of detail that can be better added via future normal maps.

2) Medium Poly version with Ctrl+2 Subdivision to preview later Hi-Res modifier application.
Now to get back to catching up on Kent's @theluthier Week 2 Casual Live Stream, so I can have a better visual idea of how approach sculpting the wood.
Homework Submission - Week 2 - Cart
@theluthier @jlampel
duerer
Here is my sculpted Hi-Poly Cart. I have synced my WIP file to the Google Drive for closer inspection.

(28 minutes to spare before deadline.)
Looking really great! I also had a (very) quick look at your file - great work on keeping the file efficient and still getting the detailed sculpt.