@jackibar
You don't need floating text or tables. Or did I understand something wrong?
The thumbnail in my examples is just an image at the beginning of the paragraph. It is shown well in the Calibre viewer and in the Mobipocket emulator including the working link.
<p style="text-indent:0.50em"><a href="muc.gif"><img src="cap.gif" width="26" height="30" border="0"></a>This is an example with a thumbnail at the start of the paragraph and text-indent. The thumbnail refers to the picture in original size.</p>
The image in original size is either shown in an external viewer (Calibre) or in an internal viever (Mobipocket). You need the button of the device for navigating back.
The layout with tables will be ruined, if the reader resizes the font-size.
George