Tower kits used to be quite a thing (and Elbox in Poland still makes them new)
Most likely you will need a new backplate for your case with cutouts as all slot positions etc are in the wrong place. Not to mention that with the 3k/4k you need to somehow handle having either all expansion cards at a odd angle or get a busboard.
With a smaller board like the 4000's you could also go for a E-ATX case and use extension cables to mount plugs in a sane way.
I dunno, quite a bit of effort involved to do yourself and it depends on how comfortable you are with metal working.
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