if you plan to move to 37's take a pass on this deal. the expense you'll go through to build this up is not worth it. save your money for a PR44.
By the time you buy everything to build and repair and then sell your D30, you may not be too far from affording a PR44 - put the expense of repairs to upgrade your PR44.
Do you know what parts you want? Do you know what from the D30 can be re-used?