If lewa is from same chipset which you want to port, nothing needs to be changed, apart from camera libs, WiFi libs and some firmware files and of course the kernel.
If I had a working computer I would have had done it despite this that I sold my device.
P.S It's very easy to do porting at times.
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WORKED AS A TESTER AND 'HALF'-DEVELOPER FOR CM7 PORTS AND CUSTOM ROMS FOR GALAXY 5 @ MadTeam FORUMS, QUITE LEARNER