http://www.dakkadakka.com/dakkaforum/posts/list/65.page JForum - http://www.jforum.net 40k off and on for about 10 years and my main interest is terrain building, is there a forum on here for that
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The "Painting and modeling" (PM for short) forum is what you're after.

Heres some cool threads for terrain.

http://www.dakkadakka.com/dakkaforum/posts/list/237785.page

http://www.dakkadakka.com/dakkaforum/posts/list/243963.page

http://www.dakkadakka.com/dakkaforum/posts/list/403974.page

http://www.dakkadakka.com/dakkaforum/posts/list/471221.page

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and Welcome to DakkaDakka!]]> http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5936624.page http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5936624.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5937216.page http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5937216.page GMT
Welcome to Dakka ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5937362.page http://www.dakkadakka.com/dakkaforum/posts/preList/545446/5937362.page GMT