Concerning Muntaner you can consult Wikipedia : Muntaner, almogavars, ...

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This is a 600 pages document easy to consult. The .pdf format allows a quick and ( more or less ) precise search.
You have to click in the "binoculars" icon and introduce the word of your interest : mace, Gallipoli, horses, crossbow-men, perpunt, reins, Palermo ,...etc

Some words ( for instance "épaulières" ) seem not to work properly.

I have just checked the translation but it seems OK. The spelling of the names follows the Spanish translation not the Catalan one of the original chronicle.

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The Chronicle of James I, King of Aragon Surnamed The Conqueror
http://libro.uca.edu/chronicleofjames/chronicle.htm

( This format allows an easy reading ).

The chronicle exists in .pdf format with small text but with the Adobe Search :
http://www.yorku.ca/inpar/jaume_forster.pdf

Among other aspects the document contains some references of the real use of war engines ( trebuchet, mangonel, fonevol, ...) and naval forces ( galleys, lenys, tarida,...).

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I have checked some parts of the translation and it seems good enough. In my opinion the translation was based in a Spanish translation of the original in Catalan language. Some minor doubts can be corrected by a reader who knows Catalan.