Nice work so far biotech.
I do agree with Freak about the nacelle location, which brings me to another point. I've always thought this runabout concept design would slot right into the shuttle lineage somewhere between the NX-01 shuttlepod and the TOS shuttlecraft. It would work pretty much as is, scaled down somewhat, for a shuttlepod follow-on design, or with nacelles slung TOS-style from short little struts under those rear winglets. You've got to admit the overall shape is a more tapered version of the TOS craft and the front windows look like a good lead-in to the TOS arrangement (their size would actually suit a smaller craft rather than the scale suggested by that little TNG figure).
The 24th century trekverse is crawling with canon and fan made smallcraft, yet scan the ol' www for anything between ENT and TOS and you get, well...pretty much nuthin'. Might be a good opportunity to fill in the gap here...
