determining chassis sizes before ordering

So I'm planning on buying a blank chassis and building an amp from scratch. I've never done reverb and tremolo in an amp before. I'm building a lite IIb ish amp with a bias wobble trem and a one tube reverb. Will be using a cap can for filters. So that will make 4 12ax7's, and 3 octals. With maybe a little extra room incase I want to mod the thing out and not have everything crammed... how big of a chassis do you think I'd need? Cedist only carries up to 16 or 17" chassis. Are these going to be big enough or should I get a bigger one made from say these guys? http://ddawgamps.com/Amp_Chassis.php

I just built a similar amp in a 4x17 chassis. Just enough room, but an extra couple if inches would be a must if you ever wanted to add a tube. For the money you may as well step up to the deluxe dawg chassis and have some extra inches. Figure they got Princeton Reverbs in a pretty small chassis without many complaints.

My chassis's always end up being too small.

yeah, I can deal with tight chassis, but don't want it to be ACTUALLY too small to fit stuff in. Also don't want wire runs to be ridiculously too long. I was thinking the Deluxe Dawg chassis as well. 19" might be overkill though? Deluxe reverb sizeish? room for more 9 pin sockets and pots... but I think Dr Z chassis have plenty of room in them. It will be going into a 2x12 cabinet anyway, so it will fit the cab no matter what.