I confess I'm more of an environments guy. I can do buildings (touch them in ways you cannot even imagine, yes), even more difficult tasks like additional foliage isn't something I'll shy away from if I can give myself the time I need to get them right. Vehicles, and specifically unwrapping them, is something I prefer to leave to people either more experienced or have better tools for it.
I don't think there is a shortage of environmental assets that need a revision though... A quick run through all the various levels makes you bump into objects that date back to 1977. Perhaps what I need is a big list of em' and I can run through each of them at my own pace.
Example: Those wooden "bridges" on Bonsai always bothered me, so making a new one would be something I could do... The downside is that, as the airfield has shown me, even if I do not edit the overal shape of an object, individual map alterations to correctly apply the changes are still required. So I am not sure how to best handle something like this.
Remember, I do not do this for a living. My knowledge and experience is limited to what I know of W3D development (and the occasional experimentation in other engines).
To put a number on it, let's say I do the top 20 "most dated looking environmental assets". If the interest exists on @Pushwall's end, anyhow.