Go for it.
The VHF and UHF antennas are easy, due to smaller components.
I made a 2M Yagi from some AU angle and some AU tubing.
Used a dipole for the driven element, insulated it from the boom with some plexi-glass. Used self tappers and the little clips that hold screens in storm doors to hold the parasitics.
An omni is even easier.
I use a jpole now but I think I'll make a GP using one of these
2M/440 Dual Band Antenna, 3/8 x 24 110028 - eBay (item 150295780037 end time Feb-14-09 10:00:41 PST)
I have one on a big truck and it works fine.
As soon as I find a solenoid to gently spin a yagi 90 degrees, I'll make a dual band.
...runna pile-up on 6m SSB