Thanks for the welcome, seems like a great community.
My only concern is that having Vegas as a single city on a map (i.e. without San Fran) could turn out to be a very boring city environment. The story missions could be good, but when just free-roaming around the city it would get boring very fast, also what else could the city itself offer to story missions other than Casinos and Mob related stuff, it doesnt really have anything else.
Even in reality Las Vegas is a very boring city, that has Casinos. It is so flat and lacks diversity, it is all the same, other than The Strip of course - its just grids of houses and one story buildings.
Compared to other Cities it just doesnt offer any variety and it is also small.
The cities are by far the most important aspect to a GTA map (yet i preferred Trevors area much more in GTA5, Los Santos was quite dull)
imo the only way Vegas could work in a GTA map is if another City like San Fran was also on the same map.
I wouldnt have any worried that having both of those cities together in one map could detract from either of the individual cities or surroundings.
San Francisco would require the main focus but that is just because Vegas would be so easy to do by comparison (its just a big square divided into grids and The Strip). Vegas would be the same city regardless of wheather it on its own as the single city or if San Fran was also on the map - there just isnt that much to Vegas to recreate, its easy (just The Strip, and the rest is just grids) compared to LA for example where R* couldnt include/recreate all the areas of the city.
Also Id imagive it would be quite a bit easier for R* to do both the desert environment and the forrest/Countryside now after GTA5 covered both of them areas.
I wouldnt mind San Fierro as a single city as long as it would be a lot!! larger and better than Los Santos was in GTA5 (i was very dissappointed with it from the moment the map leaked) but I just dont think I could be happy with just Las Venturas on its own, it would have to have San Fierro to support it, especially when doing the 70'd period as they probably wouldnt do it again - it would be a missed opportunity, and a huge one at that imo.
I think the map would work great with both areas - have a small town (like Reno or Carson City) to the nort east of San Fierro with a few inter-connected Lakes near it, have rivers running out of them - some west to San Fiero, the largest river flowing under Golden Gate Bridge. Have another large river out of one of the lakes that flows down South east near Las Venturas to form another lake - i.e. Lake Mead and the Hoover dam from where it then flows west and enters the ocean to the south of San Fierro - Have the Grand Canyon at some point along it. Then the main motorway and lots of secondary roads - I want lots of them long straight desert roads so you can recreate movies like Vanishing Point.
Would be great with multiple characters, 2 would be a good number - one in each area and divide up the stroy nicely between both areas.
Thats my view of what it should be anyways