All the information for the original listings on this site were downloaded directly from the NPS and NRHP. You might wish to take up the error corrections with them - good luck with that. Photographs of extant NRHP locations, and posting of newer entries are made by volunteers, who hopefully have good resources available. However, as you already know, once an error is in a computer database, it is essentially there forever.
Please correct these errors:
Maria Sweek named her home, which she designed and had built, Willowbrook, not Meadowbrook. This error is the result of poor research and reporting to OHS done in the '50s by a member of the DAR, which as persisted to this day. I made a correction on Wikipedia several years ago and just found that yours is identical to what they had posted.
The structure is not brick, it is thoroughly wooden, as anyone looking at pictures on the web will clearly see! Only the chimneys are brick.