You could make a buck using timber and using your table saw cut say 3mm strips of pine or douglas fir say 30 x3 ,lay them over the buck,then staple your mat to it ,doing one side at a time,this method has been used many times in some of the older50's,60's,70's home made kit cars,basically its the same as foam core ply/balsa /foam as many"one off yachts"
use,think of all the money you will save,also look up vacuum molding machines home made/diy/homebrew on the net for a different approach.Our American friends often use the term "homebrew" for DIY. David