I think you're actually looking for Jensen 'methodology' but you will probably get some 'mythology' too depending on who you ask...
I'll let the 'Gurus' chime in as I try and stay way from those $$ MKII's
edit: You're asking the difference in the MK1A and MKII 'shells' ?? for one, there's no battery lid/ fuel pump access door on a MKII.. it's a stamped steel section
duke,
what do you mean by "halmarks" ?