There are several very good articles on the community here that cover this area.
If you are after a copy of WInPE to start building a boot environment then this can be sourced from MS here:
Additional information on adding drivers to WInPE located here; (For LDMS v9)
This should get you started on the creation of a WinPE system for your imaging,
Please let us know if you need more information or not
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