id say its a good cycle, maybe trens a fraction to high for my liking, but most would see some great results
as for the question relating to the national stage, yes its very possible all you need in terms of anabolics is wat you suggested to get to the size of a national competitor, not the condition and portions of one,
besides IMO id say before you stand on any stage introducing some winnie or masteron a few weeks out is a must, the stuff gives a great finish to a physique wen its lean, dry and trened up
on a side note: i do know a guy who use to be an IFBB pro, and he used test, tren, HGH and insulin predominantly , but the doses he told me he used were 3-4 times greater then what you suggested in your cycle