Here's what I think the versions should go like, post your ideas about it too.
0.3.5: Mostly just getting GTA3 Multi that works enough to have it really utilize GTA3 (Less Lag, Peds+Cars, More Weapons, Gamemodes, Chat, etc.)
0.4: Improving GTA3 Multi and experimenting with GTAVC Multi.
0.5: Perfecting GTA3 Multi
0.6: GTAVC Multi now 0.3-ish
0.7: GTAVC Multi now 0.4-ish
0.8: GTAVC Multi perfected
0.9: Last few ideas put in
1.0: Last lag+bug reducing and last few big ideas