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Interesting. I don't need/want the sled, as the case will hold the cells + other stuff, but you're effectively voting for spring clips.
Those here are "keystone 228 & 209", which can be
bought separately on mouser, and even have
data sheets. Just a shame there's not a single mention of their safe carry capacity. Nor even physical layout requirements.
By way of example, here are 3 of those clips. The centre one as supplied (as best as can be derived from the rubbish dimensioning in the spec sheets!).
The other two under tension from (as yet) invisible cells:
The difference between the two outer springs is 1° of rotation of the front face about the lower radius centre, which translates to 0.1332mm of axial displacement.
That difference is critical. If the insertion of the cell causes the face of the clip to rotate exactly 24°, then the interface between them looks like this:
So if the face of the 9 dimples, and the face of the cell are exactly flat and parallel, you get a gnat's over 7mm², which is a little more than 5.2mm² cross-section of 10 AWG cable recommended for carrying 30A DC.
But if the alignment is such that the face of the spring clip rotates 1° less (or more) then the interface between them looks like this:
And that really is "best case".
Those clips may be adequate for the levels of current deliverable by AA or even C or D size dry cells. but for Li-ion cells, not even close.