Your Sharpie outline is pretty rough so I took the picture, brought it into Paint.net, cropped the image down to just the rifle, converted it to Black&White, used the Magic Wand to remove the background. Saved the images and brought it into Aspire as a Bitmap. Selected the Trace Bitmap tool, Black&White Type of Trace, set the Threshold to Max, Corner Fit to 100% and Pixel Noise to 10. Clicked Preview then Apply. Tweaked a few vectors using Node Edit then using the Offset tool created a Outward Vector for pocket clearance.
Note: You didn't add a tape measure for scale in your picture. That will help to accurately size the image in Aspire.
Maker of Chips