Autocad .NET standalone application issues

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I'm attempting to develop a standalone application.
I've been reading through what i belive to be up to 90% of all related posts and can't find anything to help me get started.
What I'm doing? - Accessing and changing / adding SummaryInfo Custom properties and inserting an image in the model layer.
What I've tried?
Using ObjectArx ...mgd.dll files - without success something about invalid program
found that you are supposed to use com files..
re-wrote the code to use Interop and Interop.Common .dll's
The Interop .dll file method is super slow, as it starts the application ( not in memory ) to alter these things. (using .Net 4.0)
Is there any other way to change these 2 things (image insert, custom properties) in a faster manor?
Requirements:
Load acad or its db in memory from an EXTERNAL program
Change properties and insert image capabilities
save as different file.
Thanks for any advice.