The Presto Plus 040 is the ideal upgrade for you. As you say, they are very rare. If anyone has one, can they post a report on how the RAM upgrade works, please.
The LC has a single expansion slot, which is PDS so you can't use NuBus in there. Third party PDS video cards for the LC exist, giving better resolution and colour depth, but you will still be stuck with the 68020 and limited RAM. If you put a card in the PDS slot, you can restore Ethernet using a SCSI<>Ethernet adapter externally.
Using Flash as a SCSI hard drive is doable, and there is a separate thread about it if you poke around the Compact Mac area.
Realistically, you are close to the limits of an LC and if it were mine I would leave it alone, preserving it as the perfect ShufflePuck time wasting device. Then, I would buy an LC475 and hack away at that -- a similar pretty form factor to the LC but more fun to play with.
The LC has a single expansion slot, which is PDS so you can't use NuBus in there. Third party PDS video cards for the LC exist, giving better resolution and colour depth, but you will still be stuck with the 68020 and limited RAM. If you put a card in the PDS slot, you can restore Ethernet using a SCSI<>Ethernet adapter externally.
Using Flash as a SCSI hard drive is doable, and there is a separate thread about it if you poke around the Compact Mac area.
Realistically, you are close to the limits of an LC and if it were mine I would leave it alone, preserving it as the perfect ShufflePuck time wasting device. Then, I would buy an LC475 and hack away at that -- a similar pretty form factor to the LC but more fun to play with.