Having had a total search of all my bits last night I have found the following bits, ignoring anything with chaos symbols, so most of these are from my 2nd edition eldar and 2nd edition blood angels.
Around 100 boltguns. So plenty of them, shame I can only use 1 in my entire gang unless I get a rare one.
About 10 boltpistols without arms, around 20 with arms.
Much more than 200 knifes/swords/clubs etc.
About 30 chainswords with arms attached. Again I can only use one so I probably don't need all these.
Two 2nd edition eldar lasguns. Might be the standard weapons sprue lasguns from that era, im not sure.
3 2nd edition autopistols.
1 2nd edition laspistol.
1 plasma gun, a metal one spare from my recent 5th ed chaos army [although it is an imperial one]
3 rat ogre arms with the cannon. Can be used as shotguns with a bit of cutting down and converting. I also have empire militia guns.
2 reaper autocannons, one metal, one plastic. Plastic one will be cut down and converted to heavy stubber.
3 powerfist, 2 left arms and one right.
2 power axes.
2 power swords.
3 flamers and 1 heavy flamer.
So all in all, I have quite a collection of spares. On the GW specialist games site there are only 4 delaque models. Really I just need to get my hands on some guardsmen, as I can convert lasguns into autoguns with bolter clips
Thanks for the offer Midaski, but I think I will probably use Steel legion who already have trench coats or maybe Catachans if I am feeling poor! I will probably use some of the great empire free company heads too.
With the parts I have, I can do a leader, heavy, three or four juves and probably two-three gangers. With a box of imperial guard to supply bodies and las/autoguns I should hopefully be set!