Yeah .040"/1mm should be fine. 1.5 or 2mm would be stiffer, but somewhat harder to work with (more than 1mm thick has a tendancy to snap at an angle, I find). I heartily recommend Evergreen, but Plastruct has some cool specialty bits. I'd be cautious getting cheap stuff; I've got some 1.5 or maybe 2mm stuff I salvaged from PetSmart that is far more flexible than the 1mm Evergreen.

I use 1mm for all my structural work.

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SG

Ghost's Paint Blog, where everything goes that isn't something else.

I use 1mm Plasticard for basing just about everyone, but I would recommend avoiding Evergreen and going with Industrial Plastic Supply, Inc, which is where I get my sheet styrene from.

If buying 1mm (.040") styrene in 12"x24" sheets, Evergreen charges $6.20 a sheet, whereas IPS charges $1.50. Buy a pack of 16 sheets for $24, and you'll be set for a long while.

Id second Signals advice on buying bulk HIPS if you need 1mm plasticard, evergreen and other 'hobby' suppliers are a rip off. Educational materials suppliers are often a good bet for getting packs of it in the UK.

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AFK with real life, still checking PMs

Hmmm... interesting. I've been living off the 1mm I got on the local GW account for a GD table (that I seriously overestimated the needs on) for the past five years. I'll have to keep this less expensive supplier in mind for when I run out.

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SG

Ghost's Paint Blog, where everything goes that isn't something else.

If you in easy reach of east London, the 4D Modelshop near Aldgate sells plasticard sheets in many different thicknesses, and at very large sizes. I think I paid about £30 for 6 square meters of the stuff, which is probably more than I'll ever need.

Hi,
Plasticard is very easy to use, but if you want epic make sure you get a couple of thickness level.
The 1mm is great for the basic structure, details can be added from thinner sheets later on.
Also get some polysterene liquid cement, it melts the plastic and creates good bonds.
The best I know is Tamiya's, I recommend to get the regular liquid cement, and the extra fine flowing type. The fine one is used to strengthen the bonds after you glue two parts.
HTH,
Eyal.