So I just brewed a 1.035 Scotish beer, with American hops ... so its not to Scotish

Any how I want to brew a second beer on top of the yeast cake from the first to make a nice big cake for a wee heavy or Barley wine (a third beer). My questions are these,
1)For the second beer can I go dark i.e a porter or stout? Will the SRM afect the wee heavy or barley wine.
2) For the second Is there a OG I should stay below to make the yeast in prime condition for the the big beer?
Thanks
Tim
OH the yeast is a WL001