how to position item in solidworks assemblies correctly

I hope this file helps your problem

You've uploaded the assembly file but you also need to upload the part files to go with it. Try pack-and-go to create a zip file and upload that.

It sounds like you need distance mates. You can also use these with that planes that are within parts.

this zipfile is all parts in assembly i have made some changes but i still need help placing the items above. thank you aled

I havent had a chance to download, but I think what you might be looking for is the "parallel" mate relation. It allows you to specify how far apart two part faces or edges can be.

yes i do not know how to add the "gap" or distance from an edge or face.