I'm not sure the purpose of copying the catwa head, is it for your own learning, or for wearing it in SL or other games?<br />
If it is to use it in SL, you are better off buying the head instead or getting a free head, because it is a pain to use a clone head in SL, and worst still it is easy to be spotted and reported (unless you can figure out how to change the creator's name). The reason is, without the hud everything is rather complicated to do, and as far as I know, it is difficult to clone the hud because it is not possible to clone the scripts from the hud.<br />
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Cloning the head (I think the genus head is easier to clone and use, but the neck line is a problem): the easiest is to just search in this website, I think someone has copied it already. To do it yourself, you can either use hydrastorm or darkstorm. There are step by step guides again in this website. Just two extra points for you to note:<br />
1. it takes about 45 seconds to copy the head using hydrastorm or darkstorm (about 20-30 seconds to copy the eyes and jaw). ie after pressing Save as XML, wait for 45 seconds, and try not to do anything during this time. After 45 seconds, immediately close hydrastorm or darkstorm (to avoid the cache being overwritten). <br />
2. after closing hydrastorm or darkstorm, close the MeshSL as well. Then rename the XML file without any special characters. eg: to something like untitled.xml, then reopen meshSL and choose the renamed file. You should encounter some error messages, just press continue at each error. Before you press the create DAE button, again you need to wait for like 15 seconds.<br />
If it is to use it in SL, you are better off buying the head instead or getting a free head, because it is a pain to use a clone head in SL, and worst still it is easy to be spotted and reported (unless you can figure out how to change the creator's name). The reason is, without the hud everything is rather complicated to do, and as far as I know, it is difficult to clone the hud because it is not possible to clone the scripts from the hud.<br />
<br />
Cloning the head (I think the genus head is easier to clone and use, but the neck line is a problem): the easiest is to just search in this website, I think someone has copied it already. To do it yourself, you can either use hydrastorm or darkstorm. There are step by step guides again in this website. Just two extra points for you to note:<br />
1. it takes about 45 seconds to copy the head using hydrastorm or darkstorm (about 20-30 seconds to copy the eyes and jaw). ie after pressing Save as XML, wait for 45 seconds, and try not to do anything during this time. After 45 seconds, immediately close hydrastorm or darkstorm (to avoid the cache being overwritten). <br />
2. after closing hydrastorm or darkstorm, close the MeshSL as well. Then rename the XML file without any special characters. eg: to something like untitled.xml, then reopen meshSL and choose the renamed file. You should encounter some error messages, just press continue at each error. Before you press the create DAE button, again you need to wait for like 15 seconds.<br />