Another option to EZ Metrics would be Corel DESIGNER Technical Suite 12. This product is based on the same core engine as CorelDRAW, but has been build from the ground up for technical illustration, including projected drawings (isometric, ...), dimensioning, call-outs with halos, hatch fills, ... You can get a trial from the download section on this site or from www.corel.com. And as a CorelDRAW owner, you are eligible to the upgrade price of Corel DESIGNER.
Gérard