i think it would be more usefull if u dont spawn the Spiders in the vault so you could spawn instead of the Spiders these radbugs with low level this would be much easier for Noobs because they are the most time in the vault^^. Mapsuggestion:
rp_cscdesert(???) i dont know the exact name but would be also a good map
Npc Suggestion: you could spawn a Help Npc at the spawnplace.