EThOS (Electronic Theses Online Service) is hosted by the British Library and provides free access to a lot of Theses from the UK.
Search through the database I've fund a very good collection of usefull works:
The road to Naples: Florence, the Black Bands and the army of the League of Cognac (1526-1528)
Arfaioli, Maurizio
The military obligations of the English people 1511-1558
Goring, John Jeremy.
Guns in Scotland : the manufacture and use of guns and their influence on warfare from the fourteenth century to c.1625.
Caldwell, D H.
Fighting 'Jacob's warres' : English and Welsh mercenaries in the European wars of religion : France and the Netherlands
Trim, David.
Sir Francis Vere in the Netherlands, 1589-1603 : a re-evaluation of his career as Sergeant Major General of Elizabeth I's troops.
Borman, Tracy.
Scottish mercenaries in the service of Denmark and Sweden, 1626-1632
Fallon, James A
Scotland, Denmark-Norway and the House of Stuart 1603-1660 : a diplomatic and military analysis.
Murdoch, Steven W
Scots and the Swedish state : diplomacy, military service and ennoblement 1611-1660
Grosjean, Alexia
General Patrick Gordon on Auchleuchries : a Scot in seventeenth century Russian service.
Herd, Graeme P
The Royalist Army in Northern England 1642-45.
Newman, P. R.
Integrating Documentary and Archaeological Evidence in the Investigation of Battles: A Case Study from Seventeenth-Century England
Foard, Glenn
Just go to ethos.bl.uk/Home.do register and use the database to find and download the theses.
looks at a fast-assembly naval kit for the Age of Sail.