I will get around to trying the new GUI soon.
Can you please elaborate on what the version cutoff is for a "deprecated" wallet? (My apologies if it is in the readme or something)
To be honest, I'm not sure, but I think it is basically if you created a wallet in April or May. The current workaround for deprecated wallets is to use v0.8.8.4 to import the keys file and update the wallet, then you can use it in v0.8.8.5/6, but it will be fixed in the next simplewallet release. I'm pretty sure if you have an electrum seed for your wallet, then it's not deprecated.
My compliments on your work.
EDIT: I had to much beers, if I am reading the text correct it shouldn't eat up your RAM. If I can give you some advice, I would make the "tabs" horizontal instead of vertical, bit hard to read now (could be the alcohol, but still ). Another point, if you create a new wallet the seed will be stored in a plain text file without encryption. I would advise to make some kind of announcement everytime you create a new wallet to encrypt to file or to make it a default thing to encrypt the textfile with the seed.