I want to make a trapmaster with the craftable spiders as the focus but don't know what skills to compliment it. I'm thinking about using sneak alchemy for poisons and archery but mostly only shooting poisoned arrows and maybe pickpocket. Armour will ethier be light or I'll be using clothes

Sounds like more of a secondary skill for a stealth character than a full blown build. Anyway you should probably include runesfi you are going to be a trap master. Let me know how your craftable spiders do against the first Legendary+ dragon you face.