Yep,
When i was building my flash cartridge, i fist thinked about using Sram
-4mo of 2*8bit sram = 300$
Then i thinked about Eeproms:
-4mo of 2*8bit eproms = 150$
Then i thinked about flashs:
-4mo of 2*8bit flashs = 10$
But the So44 was no more available and I received some Tsop models (with 0.25mm between pins), i finaly solder them but what a **** job.
So, as arakon said: Don't try, i can confirm how it is hard.
I'll buy a tototek soon because i'm interrested about the save features that my own card can't do.
Bye
Fonzie