While these may work they both have some potential issues.
The first has limited current w/o a separate supply except
the 2nd PSU plug adapter. Someone could buy or make a
supply for it, a relatively easy project but for the low
cost of most hubs it wouldn't seem a good use of time. Also
it may only be a personal preference but I don't like
octopus arrangements where devices or wires come out on more
sides than one, or two if only to keep the host data and
power cables in back.
Second one has the ports a bit close as I'd mentioned, some
devices may not fit side-by-side. Many would, but in
context the devices were card readers which could be the
pocket type w/integral plug, those tend to have larger
dimensions. It comes closer to my ideal but at $17
delivered, it's more expensive than a USB2 card and would
still have the bottlenecks with concurrent drive access.
PCI cards are about same cost delivered, maybe slightly
higher $2x range if extension cables are needed too (though
some thumb sized devices already come with extension
cables).
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&Description=USB2 PCI&bop=And&Order=PRICE