More malt will make a difference to body and flavour.
Try a pale kit like coopers cerveza, 500-700 g malt extract, 200 maltodextrin, 300g dextrose and 10- 15g hallertau hop pellets. Mix up your extracts, tin and dextrose in a couple of litres of boiling water, steep the hops for 5 minutes, then top the mix up in the fermenter to 20 L total. Use some fermentis us05 yeast, keep the temp to 18 degrees and let it sit for 3 days after fermentation is complete. Let the beer carbonate in the bottles then chill them for abother week before drinking.