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Yes, I also think that the character had problems writing 羅 (and gived up writting ら) and 校.
About the "巾", it's an written abbreviation of 門 in three strokes. It can be conbined with any 門...

On my dictionaries, entry for 糞:



so it would be like "its no use worrying for XX", "XX is out of the question/unthinkable/impossible".

don't know the context, but could be like "it has...

As for the first, from context, I think the シメる intended was this: http://zokugo-dict.com/12si/simeru.htm
I'm not sure but「いっぺんシメとくか」(~とく is ~ておく) could be like "do you want me to kill you?"-ish...

Oh, thanks a lot. Certainly it seems so. Shame on me, such an easy word (but always used in kana ケンカ).
Thanks for the reference, now it makes lots of sense. ;)

I have trouble reading a couple of kanji, mainly because the quality of the scan.

It's the box on the top:
http://a.imageshack.us/img413/3104/0152g.jpg
I had transcribed:
高校空手道部血風録‼...