Cooking WM Roms on Cheap Chinese WinCE devices

[mrspeedmaster]

How easy is to cook a custom WM 6.1 ROM on a Cheap Ebay GPS PNA, Windows CE PDA or Single Din Car Stereo.

I've seen some single din Chinese car stereos and PDAs that run WinCE 4.2 or 5 with Igo. They're not running Windows Mobile (with Today screen).

Are there any wikis or discussion on these cheap no-name devices. I see a lot of people unlocking MIO PNA GPS devices so I think it is entirely possible.