Hey man I think it is an excellent idea,. I am not really one for much stickers n my car, maybe one for under the engine bay or something. But yeah i think it is a cool idea.
I like the Daewootech.com, but put it on the back of the shirt
Also, leave the 'forums' off the shirt, it takes away from the overall look.
The front of the shirt could have the Daewoo symbol on the chest with Daewootech.com under it.
I would take a sticker and put it on my driver's side back window glass along the bottom if it were in black, white, blue or silver.
Perhaps 3/4 of an inch tall 10 inches or so long; nothing too big.
No symbols...some of us drive Chevy or Suzuki branded Daewoos and it would look a bit odd if we haven't swiched them yet. Just the website name would be cool for me! Maybe some other type of graphic like. Dates of group meetings like the ones some of the members are planning. I dont know just spitballing it around
I think with all those symbols its starts getting little crowded.
"Less is more" was always taught it my art college classes.
Keep it simple, to the point, and look at plenty of references. Look at
other shirts with similiar ideas or themes. "you are only as good as
your references"(another art college quote)
Im loving the idea of the t shirts, either one is nice, No forums on it tho, as stated above it takes away from the overall look. Stickers are nice too, maybe make the daewootech.com sticker separate from the logos and we can purchase our peticular vehicle logo seperate, colors like blue, silver and black are a must for selection, lets see where this goes from here,
Dave
I like the orginal shirt, just daewootech.com on the front, maybe your car symbol on the back, or viceversa, but what about stickers? im very interested in stickers for my car an d a shirt if it isnt too much graphics on it
Only for USA and Canada or also to Europe? 
THX