Vintage Map Combination and Illustration

Vintage map composition (creating one large map using several smaller maps of adjacent counties and waterways, while maintaining accuracy of scale, location, and style of the main "base" map.) I need someone to use three or four digital files of vintage maps of several adjacent areas to create one large map that includes all of those areas, but features one of them. The final combined map should be high resolution (300 ppi at 36 x 48 inches), accurately reflecting the locations in the separate maps. It should resemble a 19th-century vintage map with slight color added (which I can help specify), while maintaining the style and geography of the main "base" map provided. (See attached images for reference... The "Chat GPT" file is included as an example of what I am trying to achieve (combining the locations, but featuring Harris County from the first map). The main problems with the Chat GPT version is that it is not accurate enough with some of the geography and locations, and the resolution is not high enough. But it provides an example of what I need done.