, i downloaded your "Dump_Catalog_Dell_VenuePro_OsBuilder", extracted it, install lastest OSBuilder and open extracted folder in OSBuilder.
Make some registry changes in .rgu file of OEM/OemApps section related to developer unlock and prevent relocking. Then after Check/Clean rgu files, click "Play" and the ROM compiled successful without errors. New files in /Dump/Temp directory are created (imgfs_new.bin, xip_new.bin, and others txt...).
So, i think we need the magic tool to convert this to make DVP compatible FFU with all necessary things like Radio fw, and other's (or not? i don't know, i'm not prof developer
And we need a brave and fearless guy to flash this FIRST CUSTOM 7004 DVP ROM with developer unlock!
If everything is worked, next step is update SYS part to at least 7720/7740 and (more important and hard) OEM and XIP part from official Dell Mango fw update, that we current don't have in FFU file (this update coming to our DVP only with Zune update
Device: Dell Venue Pro 8Gb