OK, Jon, here is a bit of a glossary.  John of Brisbane, incidentally, has posted an extensive  Glossary of Scottish Words  which you will find useful.

biggin = building
bow-kail =cabbage
door cheek = threshold, door-post
riggin = roof
carle = man
unco = foreign
I downa bide = I can't abide
triggin = decoration
routh = plenty
kin = possibly, in this context, kindling?
reek = smoke
steek = shut, fasten
girdle cakes are oatcakes baked on a girdle (a circular iron plate). I assume that this, and the references to bread and cheese, are symbolic.
bag = built
muckle =(in this context) very
priggin = haggling, bargaining
dink = nice
douce = kind
claught = grab
wee bit = little
ding out = drive out
dash = dismay
whiggin = I'm guessing that this is coined from the term Whig, a Covenanter or Presbyterian, and presumably means "presbyterianisation"!

NB W' in verse 2 should of course be Wi'

Malcolm