Just finished assembling and fitting an etched replacement walkway onto a 'OO' Bachmann JPA cement tank. The kit's from PH Designs and offers an instant improvement over the solid plastic factory-fitted unit. It took a couple of hours to fold up the parts and fix everything together. There's no need for any soldering - it's designed for use with cyano glue. But something like a Hold n Fold tool is essential to get the long parts to fold accurately.
The kit costs £5.60 plus p&p and can be obtained from www.phd-design.co.uk