So in 2004, was there a big "land rush" of private ownership? For instance, a farmer who might have been leasing the land he worked from the original nobleman could now secure a mortgage and purchase the land
No.
The feudal relationship of Superior and Feuar was different from Landlord and Tenant. The feuar, or vassal, was granted ownership of the land by his Superior subject to any title restrictions which the Superior may have imposed and subject to various other Superiors' rights, for example the right to hunt wild animals for sport on the vassal's land. The amount of feuduty payable was generally much less than a tenant would pay to a landlord in respect of rent. The feuar or vassal was generally able to sell his land to a replacement feuar or vassal without requiring the consent of his Superior.