Thought it would be helpful to post pictures of  ready made crossmembers one can purchase.  Here are four, and there may be others.  If you know of one, please post it here.

This crossmember is avaiable from Snow White Ltd www.snowwhiteltd.com
4727 East Hedges Avenue  Fresno, CA 93703
(559) 253-1928
Bushing Mount

This one is available from Wisbech Engineering www.wisbech-engineering.co.uk/
Lindum House, 60 Lynn Road
Terrington St. Clement
King’s Lynn, Norfolk PE34 4JX
Telehone No. 01553 828038
Solid Mount

Another crossmember that has been around for a long time.  You may have to call and purchase a catalog www.popbrowns.co.uk
P.O. Box 2198, Harlow, Essex,
England, CM17 0TZ.
UK LOW-COST TELEPHONE: 0844 544 0960.
OVERSEAS TELEPHONE: +44 1279 412794.
ALL FAXES: +44 (0) 1279 445906 (Any time).
E-MAIL: info@popbrowns.co.uk
Solid Mount

And one that also forms a tubular cage
Hamilton Automotive Ind.
15826 Stagg St.
Van Nuys, CA 91406
call Curt Hamilton; Shop: 818-787-9695 Cell: 818-943-2323
Solid Cage