You can buy rolls of 3/16" and 1/4".
The brake lines should be 3/16" (4.8mm) going to the rear wheels.
Since you said you have a proportioning valve, you don't have ABS, so there should be either 1 line (possibly 1/4" (6.35mm)) that goes back and splits to the each wheel or two separate. (more likely)
There should be a supply fuel line, 3/8" (10mm) and return 1/4" (4.8mm).
If my memory serves (but probably won't) Honda usually puts a junction fitting near the tank for the supply, but the return goes up to the top of the tank.
There's probably only 1 vapor line from the canister to the purge solenoid under the hood. I think it's 1/4".
Tools you WILL need to either rent or buy, a tube bender, especially for the larger lines. A metric bubble flaring tool for the brake lines, compression fittings are unacceptable and unsafe. I think the fuel lines are conventional single or possibly double flare fittings if they join anywhere with fittings. A much worse scenario is the fuel lines being "o" ringed, then you have to get a hold of an even more expensive flaring tool that makes the ends to accept an oring.
Pray you don't have to drop the tank, otherwise you're pulling the rear suspension. There is a quick connect on the end of the supply line and possibly the return at the tank too. (memory is dead now)
There are special tool kits that will put the necessary ends on the line to put a quick connect flex end on the steel line.
Here is your brake line setup (I put in '98 LX)
http://www.hondapartscheap.com/sout...atcgry4=KA4AT&catcgry5=BRAKE+LINES&vinsrch=no
The prebent lines may still be available.
Here's your fuel line setup
http://www.hondapartscheap.com/sout...cgry4=KA4AT&catcgry5=FUEL+PIPE+(1)&vinsrch=no
And this at the tank
http://www.hondapartscheap.com/sout...&catcgry4=KA4AT&catcgry5=FUEL+TANK&vinsrch=no
I see two quick connect lines to the main fuel lines, so you hopefully won't need to drop the tank, however, those lines hopefully won't be frozen to the main fuel lines. The lines to the tank are plastic.
If you bring the car to a shop that can do the job completely, making the lines, the parts won't be that expensive, but the labor will be. I'd figure between 8 and 10 hours if not more to make up all the lines from scratch.
If the pre-bent lines are still avail from Honda, that's the way to go. The lines are in no way inexpensive, but I think you'd be able to replace them yourself saving a ton of shop labor.
Hope all my babbling helped.