No, of course the schematic is not available. Love to see a tool doing all the work, but i'm not lazy. For now, i don't know how, meaning of what to use? Gerber, i think are only usefull for etching and drilling.
I've already "prepared" the board in question, for heavens sake only a dual layer one, for rev-eng. Removed all parts, inventoried them, remove the silk screen down to blank copper, scanned both sides to achieve a unbended view of the layers. Also postprocessed the images to b/w. A good starting point, i guess
Only thing i could do with the image, may be to remove the mass areas which are not connected to any pad or via. But this, i guess, is only for better visualization the rest.
The principle to reverse from board seems to place the images as silk screen layers on top and bottom, then place all the parts (which are in fact only the pads), vias and connectors. Next connect everything by following each lane from pad to pad/via. This should result in a netlist. Target 3001 can do this, even in the free edition. But then some "magic" needs to encode a schematic from this netlist. This little part is what is missing for free and only available by paying thousands of Euros ;-(